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g
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st
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3
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a
ta
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e
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ti
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e
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u
si
n
g
sta
n
d
a
rd
ize
d
q
u
e
stio
n
n
a
ires
wh
ich
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re
d
e
v
e
lo
p
e
d
b
y
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se
a
rc
h
e
rs
a
n
d
u
se
d
sc
ien
ti
fic
in
stru
m
e
n
ts
f
o
r
n
o
ise
m
e
a
su
re
m
e
n
t.
Th
e
q
u
e
sti
o
n
n
a
ires
c
o
n
tain
e
d
i
tem
s
re
late
d
to
p
o
p
u
lati
o
n
c
h
a
ra
c
teri
stics
a
n
d
wo
rk
in
f
o
rm
a
ti
o
n
,
k
n
o
wle
d
g
e
,
a
tt
it
u
d
e
,
a
n
d
p
ra
c
ti
c
e
fo
r
p
re
v
e
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ti
n
g
n
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ise
e
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o
s
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re
,
n
o
ise
e
x
p
o
su
r
e
m
e
a
su
re
m
e
n
t
,
a
n
d
risk
sc
o
re
s
fro
m
e
x
p
o
s
u
re
to
n
o
ise
.
P
e
a
rso
n
’s
c
o
rre
latio
n
c
o
e
fficie
n
t
wa
s
u
se
d
to
a
n
a
ly
z
e
d
a
ta.
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e
re
su
lt
s
sh
o
we
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t
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to
rs
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ly
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iate
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re
s
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o
m
e
x
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su
re
to
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ise
wh
il
e
p
e
rfo
rm
in
g
th
e
ir
wo
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k
.
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p
a
re
n
tl
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t
h
e
re
we
re
fo
u
r
in
flu
e
n
ti
a
l
v
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les
wh
ich
i
n
c
lu
d
e
d
h
e
ig
h
t
o
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e
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r
sy
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s,
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r
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d
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y
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n
d
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ise
m
e
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n
t
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s
tes
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u
sin
g
m
u
lt
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p
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re
g
re
ss
io
n
a
n
a
l
y
sis.
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e
re
fo
re
,
e
ffo
rts
sh
o
u
l
d
b
e
m
a
d
e
t
o
m
a
n
a
g
e
th
o
se
v
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les
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y
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ra
fti
n
g
p
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li
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ies
a
n
d
c
re
a
ti
n
g
to
o
ls
fo
r
risk
p
re
d
icti
o
n
t
o
c
o
n
tr
o
l
th
e
i
n
flu
e
n
ti
a
l
v
a
riab
les
re
late
d
to
risk
lev
e
l
fr
o
m
e
x
p
o
su
re
t
o
n
o
ise
in
t
h
e
wo
rk
in
g
a
re
a
.
K
ey
w
o
r
d
s
:
Hig
h
n
o
is
e
lev
els
Occ
u
p
atio
n
al
h
ea
r
i
n
g
lo
s
s
R
is
k
s
co
r
es
Sto
n
e
m
o
r
tar
i
n
f
o
r
m
al
wo
r
k
e
r
s
T
h
ailan
d
T
h
is i
s
a
n
o
p
e
n
a
c
c
e
ss
a
rticle
u
n
d
e
r th
e
CC B
Y
-
SA
li
c
e
n
se
.
C
o
r
r
e
s
p
o
nd
ing
A
uth
o
r
:
Ar
r
o
o
n
Ketsak
o
r
n
Facu
lty
o
f
Pu
b
lic
Hea
lth
,
T
h
a
m
m
asat U
n
iv
er
s
ity
(
R
an
g
s
it C
en
ter
)
Klo
n
g
L
u
a
n
g
,
Path
u
m
th
an
i,
T
h
ailan
d
E
m
ail:
ar
r
o
o
n
.
k
@
f
p
h
.
tu
.
ac
.
th
1.
I
NT
RO
D
UCT
I
O
N
I
n
f
o
r
m
al
wo
r
k
e
r
s
ar
e
th
e
m
ai
n
lab
o
r
g
r
o
u
p
i
n
T
h
ailan
d
.
Ac
co
r
d
in
g
to
s
u
r
v
ey
d
ata
f
r
o
m
t
h
e
Natio
n
al
Statis
t
ical
Of
f
ice
in
2
0
2
2
[
1
]
,
it
was
f
o
u
n
d
th
at
th
e
em
p
lo
y
ed
p
o
p
u
latio
n
n
u
m
b
er
e
d
3
9
.
6
m
illi
o
n
,
o
f
wh
ic
h
2
0
.
2
m
illi
o
n
wer
e
in
f
o
r
m
al
wo
r
k
er
s
(
5
1
.
0
%)
an
d
1
9
.
4
m
illi
o
n
wer
e
f
o
r
m
al
wo
r
k
er
s
(
4
9
.
0
%).
T
h
e
W
o
r
ld
Hea
lth
Or
g
an
izatio
n
(
W
HO)
f
o
u
n
d
th
at
wo
r
ld
wid
e
h
ea
r
in
g
lo
s
s
af
f
ec
ts
m
o
r
e
th
an
1
.
5
b
illi
o
n
p
eo
p
le
an
d
co
u
ld
in
cr
ea
s
e
to
2
.
5
b
illi
o
n
b
y
2
0
5
0
[
2
]
.
Fo
r
T
h
ailan
d
,
t
h
er
e
is
a
r
ep
o
r
t
o
n
th
e
s
itu
atio
n
o
f
s
u
r
v
eillan
ce
,
p
r
ev
en
tio
n
,
a
n
d
c
o
n
tr
o
l
o
f
d
is
ea
s
es
an
d
h
ea
lth
h
az
ar
d
s
o
f
in
f
o
r
m
al
wo
r
k
er
s
in
2
0
2
1
[
3
]
.
T
h
er
e
is
a
m
o
r
b
i
d
ity
r
ate
o
f
d
is
ea
s
e
an
d
h
ea
lth
h
az
ar
d
s
f
r
o
m
o
cc
u
p
ati
o
n
s
,
n
am
el
y
wo
r
k
i
n
ju
r
ies
(
1
9
7
.
5
4
p
er
1
0
0
,
0
0
0
p
o
p
u
latio
n
)
,
th
e
m
u
s
cu
lo
s
k
eleta
l
s
y
s
tem
(
1
7
5
p
e
r
1
0
0
,
0
0
0
p
o
p
u
latio
n
)
,
a
n
d
n
o
is
e
-
in
d
u
ce
d
h
ea
r
in
g
lo
s
s
(
NI
HL
)
:
(
0
.
7
1
p
er
1
0
0
,
0
0
0
p
o
p
u
latio
n
)
.
Of
th
ese
d
ata,
NI
HL
s
h
o
ws th
e
th
ir
d
h
i
g
h
est m
o
r
b
i
d
ity
r
ate.
L
am
p
an
g
p
r
o
v
in
ce
is
in
n
o
r
t
h
er
n
o
f
T
h
ailan
d
.
T
h
is
p
r
o
v
i
n
c
e
h
as
f
o
u
n
d
m
an
y
m
in
er
al
r
es
o
u
r
ce
s
in
ev
er
y
ar
ea
.
A
n
im
p
o
r
tan
t
m
i
n
er
al
th
at
cu
r
r
en
tly
g
en
er
ates
in
co
m
e
f
o
r
th
e
p
eo
p
le
o
f
L
am
p
an
g
p
r
o
v
in
ce
.
L
ig
n
ite
co
al
is
th
e
m
o
s
t
f
o
u
n
d
m
in
er
al.
T
h
er
e
ar
e
also
v
a
r
io
u
s
in
d
u
s
tr
ial
m
in
er
als
s
u
ch
as
tin
,
wo
lf
r
am
ite,
s
ch
ee
lite,
an
tim
o
n
y
,
f
lu
o
r
ite,
m
an
g
an
ite,
p
y
r
o
p
h
y
llit
e,
p
h
o
s
p
h
ate,
ca
lcite,
f
eld
s
p
ar
,
b
ar
ite,
lim
esto
n
e,
g
r
an
ite,
an
d
m
ar
b
le
[
4
]
.
D
u
e
to
th
e
p
r
esen
ce
o
f
v
ar
i
o
u
s
m
in
er
als,
t
h
er
e
h
as
b
ee
n
a
n
in
d
u
s
tr
y
s
u
ch
as
m
ak
es
s
to
n
e
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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t J Pu
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Hea
lth
Sci
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N:
2252
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8
8
0
6
F
a
cto
r
s
a
s
s
o
cia
ted
w
ith
r
is
k
s
co
r
es a
mo
n
g
s
to
n
e
mo
r
ta
r
in
f
o
r
ma
l wo
r
ke
r
s
ex
p
o
s
ed
…
(
Yu
w
a
d
ee
K
h
u
n
s
a
a
r
d
)
1395
m
o
r
tar
s
.
Ma
k
in
g
a
s
to
n
e
m
o
r
t
ar
b
eg
in
s
b
y
d
r
illi
n
g
th
e
s
to
n
e
in
to
a
cy
lin
d
r
ical
s
h
ap
e.
Af
te
r
th
at,
it
is
b
r
o
u
g
h
t
in
to
a
s
to
n
e
cu
ttin
g
m
ac
h
in
e
to
cu
t
th
e
h
ea
d
an
d
tail
to
th
e
d
esire
d
s
ize.
T
h
e
s
to
n
e
is
th
en
b
r
o
u
g
h
t
in
to
a
s
to
n
e
d
r
ill
m
ac
h
in
e
to
d
r
ill
a
h
o
le
in
th
e
m
id
d
le.
Nex
t,
th
e
s
to
n
e
is
d
r
illed
in
to
th
e
c
o
r
e
o
f
th
e
s
to
n
e
m
o
r
tar
to
m
ak
e
th
e
s
h
ap
e
o
f
t
h
e
m
o
r
tar
an
d
m
ak
e
th
e
b
ase
o
f
th
e
m
o
r
ta
r
.
T
h
e
last
s
tep
is
to
p
u
t
in
a
g
r
i
n
d
er
to
d
ec
o
r
ate
b
o
th
th
e
in
s
id
e
an
d
o
u
ts
id
e
o
f
th
e
s
to
n
e
m
o
r
ta
r
to
m
ak
e
it
s
m
o
o
th
.
Fro
m
th
ese
s
tep
s
m
en
tio
n
ed
,
it
s
ee
m
s
th
at
in
th
e
p
r
o
ce
s
s
o
f
s
to
n
e
c
u
ttin
g
,
s
to
n
e
d
r
illi
n
g
an
d
g
r
i
n
d
in
g
m
ac
h
in
e
s
m
ak
es lo
u
d
n
o
is
e.
Pre
v
i
o
u
s
s
t
u
d
ies
h
a
v
e
d
e
m
o
n
s
t
r
at
e
d
t
h
e
wo
r
k
e
r
s
ex
p
o
s
e
d
t
o
h
i
g
h
n
o
is
e
le
v
e
ls
a
n
d
NI
H
L
.
Fo
r
ex
am
p
l
e,
a
s
t
u
d
y
o
n
n
o
is
e
le
v
el
i
n
t
h
e
s
t
o
n
e
cr
u
s
h
i
n
g
f
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ct
o
r
y
r
e
p
o
r
t
ed
t
h
a
t
t
h
e
m
e
an
8
-
h
o
u
r
ti
m
e
-
we
ig
h
t
e
d
av
er
ag
e
(
T
W
A
)
f
o
r
p
er
s
o
n
al
n
o
is
e
e
x
p
o
s
u
r
e
am
o
n
g
s
t
o
n
ewo
r
k
e
r
s
w
as
8
7
.
0
d
B
(
A
)
,
wh
i
le
en
v
i
r
o
n
m
en
tal
m
o
n
i
to
r
i
n
g
r
e
v
ea
l
ed
a
n
a
v
e
r
a
g
e
n
o
is
e
le
v
e
l
o
f
8
5
.
0
d
B
(
A
)
.
T
h
e
f
i
n
d
i
n
g
s
i
n
d
i
ca
t
ed
t
h
a
t
w
o
r
k
e
r
s
e
x
h
i
b
ite
d
ele
v
a
te
d
h
ea
r
i
n
g
th
r
es
h
o
l
d
s
,
p
ar
t
ic
u
la
r
l
y
a
t
h
i
g
h
-
f
r
e
q
u
e
n
cy
r
a
n
g
es
,
s
u
g
g
est
in
g
t
h
e
ea
r
l
y
o
n
s
et
o
f
N
I
H
L
[
5
]
.
T
h
er
e
w
as
a
s
t
u
d
y
o
f
h
e
ar
in
g
l
o
s
s
am
o
n
g
wo
r
k
e
r
s
i
n
a
p
la
tin
u
m
m
in
e
f
o
u
n
d
t
h
at
6
4
.
9
%
o
f
w
o
r
k
e
r
s
w
er
e
ex
p
o
s
e
d
to
n
o
is
e
le
v
e
l
e
x
ce
ed
in
g
8
5
d
e
ci
b
e
ls
(
d
B
A
)
a
n
d
8
0
.
8
%
we
r
e
d
ia
g
n
o
s
e
d
wit
h
h
ea
r
in
g
lo
s
s
[
6
]
.
T
h
er
e
was
a
ls
o
a
s
tu
d
y
o
f
h
i
g
h
n
o
is
e
lev
el
a
n
d
h
ea
r
i
n
g
l
o
s
s
am
o
n
g
t
h
e
wo
r
k
e
r
s
p
a
r
t
ic
u
l
ar
l
y
as
s
an
d
m
i
n
i
n
g
l
o
a
d
e
r
s
.
I
t
was f
o
u
n
d
t
h
at
6
9
%
o
f
wo
r
k
e
r
s
wer
e
e
x
p
o
s
e
d
t
o
l
o
u
d
n
o
is
es
g
r
ea
te
r
t
h
a
n
8
5
d
ec
ib
els
(
d
B
A)
an
d
t
h
e
p
r
ev
ale
n
ce
o
f
h
ea
r
i
n
g
l
o
s
s
w
as
3
7
%.
I
n
ad
d
it
io
n
,
i
t
was
f
o
u
n
d
t
h
at
a
g
e
o
f
y
ea
r
s
a
n
d
h
is
t
o
r
y
o
f
e
x
p
o
s
u
r
e
t
o
h
i
g
h
n
o
is
e
lev
els
we
r
e
i
m
p
o
r
ta
n
t
f
ac
to
r
s
i
n
l
ea
d
i
n
g
to
h
ea
r
i
n
g
l
o
s
s
[
7
]
.
T
h
er
e
w
as
als
o
a
s
t
u
d
y
o
f
h
ea
r
i
n
g
l
o
s
s
ca
u
s
e
d
b
y
ex
p
o
s
u
r
e
t
o
h
i
g
h
n
o
is
e
l
ev
els
am
o
n
g
a
u
t
o
m
o
ti
v
e
p
a
r
ts
w
o
r
k
er
s
.
T
h
is
s
t
u
d
y
f
o
u
n
d
t
h
at
f
ac
t
o
r
s
t
h
at
in
c
r
ea
s
e
t
h
e
r
is
k
o
f
h
e
ar
in
g
lo
s
s
w
er
e
ex
p
o
s
ed
t
o
n
o
is
e
o
v
er
9
0
d
ec
ib
els
(
d
B
A)
,
s
m
o
k
i
n
g
,
a
n
d
p
e
r
i
o
d
s
o
f
w
o
r
k
i
n
g
e
x
p
o
s
e
d
to
h
i
g
h
n
o
is
e
le
v
e
ls
[
8
]
.
T
h
e
s
tu
d
y
was
c
o
n
d
u
cte
d
o
n
t
h
e
e
x
p
o
s
u
r
e
to
n
o
is
e
o
f
s
t
o
n
e
p
r
o
ce
s
s
i
n
g
w
o
r
k
er
s
i
n
n
o
r
t
h
er
n
T
h
ail
an
d
.
T
h
e
r
es
u
l
ts
o
f
th
e
s
t
u
d
y
f
o
u
n
d
t
h
a
t
3
6
.
2
%
o
f
th
e
w
o
r
k
er
s
'
e
x
p
o
s
u
r
e
t
o
n
o
is
e
ex
ce
ed
ed
8
5
d
e
ci
b
els
(
d
B
A
)
.
T
h
is
s
t
u
d
y
i
n
d
ic
at
ed
t
h
at
t
h
e
j
o
b
p
o
s
iti
o
n
s
wer
e
i
m
p
o
r
t
a
n
t
f
o
r
e
x
p
o
s
u
r
e
t
o
h
i
g
h
n
o
is
e
le
v
e
ls
[
9
]
.
I
n
a
d
d
iti
o
n
,
a
s
tu
d
y
o
f
f
ac
to
r
s
a
f
f
ec
t
in
g
h
ea
r
i
n
g
l
o
s
s
a
m
o
n
g
c
o
al
w
o
r
k
er
s
r
e
v
e
ale
d
t
h
a
t
a
g
e
o
f
y
ea
r
s
,
wo
r
k
ex
p
e
r
i
en
ce
,
a
n
d
p
e
ak
n
o
is
e
le
v
els w
e
r
e
im
p
o
r
ta
n
t
v
a
r
ia
b
l
es
in
le
ad
in
g
t
o
h
ea
r
i
n
g
l
o
s
s
[
1
0
].
All
th
e
ab
o
v
e
r
esear
ch
f
o
cu
s
e
s
o
n
f
ac
to
r
s
af
f
ec
tin
g
h
ea
r
in
g
lo
s
s
am
o
n
g
wo
r
k
er
s
wh
o
ex
p
o
s
ed
h
ig
h
n
o
is
e
lev
els.
Ho
wev
e
r
,
a
f
ew
s
tu
d
ies
h
av
e
b
ee
n
im
p
lem
en
t
ed
to
id
en
tify
in
f
l
u
en
tial
f
ac
t
o
r
s
with
r
is
k
s
co
r
es
f
r
o
m
e
x
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els.
I
t
is
clea
r
ly
s
ee
n
th
at
t
h
e
ab
o
v
e
r
e
f
er
s
ar
e
lack
in
g
.
T
h
is
is
an
im
p
o
r
tan
t
co
n
s
id
er
atio
n
to
en
s
u
r
e
th
e
s
a
f
ety
o
f
wo
r
k
er
s
,
esp
ec
ially
in
f
o
r
m
al
wo
r
k
er
s
s
u
c
h
as
s
to
n
e
m
o
r
tar
wo
r
k
er
s
wh
o
ar
e
n
o
t
p
r
o
tecte
d
b
y
lab
o
r
p
r
o
tectio
n
laws
o
f
T
h
ailan
d
.
T
h
e
r
ef
o
r
e,
th
is
s
tu
d
y
aim
ed
to
ass
ess
as
s
o
ciatio
n
s
o
f
r
is
k
s
co
r
es f
r
o
m
ex
p
o
s
u
r
e
to
n
o
is
e
r
elate
d
to
th
eir
v
ar
iab
les a
m
o
n
g
s
to
n
e
m
o
r
tar
wo
r
k
er
s
wh
o
ex
p
o
s
ed
to
h
ig
h
n
o
is
e
lev
els
d
u
r
in
g
th
eir
wo
r
k
in
L
am
p
a
n
g
,
T
h
ailan
d
.
T
h
is
f
in
d
in
g
p
r
o
v
i
d
es
th
e
cr
u
cial
d
a
ta
b
ased
o
n
h
ea
lth
r
is
k
ass
ess
m
en
t
an
d
r
elate
d
f
a
cto
r
s
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els
to
ass
is
t
in
p
r
o
p
er
p
r
ev
en
tin
g
ac
tio
n
s
an
d
co
n
tr
o
llin
g
s
tr
ateg
ies.
2.
M
E
T
H
O
D
T
h
e
s
tu
d
y
ar
ea
was selec
ted
in
Pich
ai
s
u
b
-
d
is
tr
ict
,
Mu
ea
n
g
d
is
tr
ict,
L
am
p
an
g
p
r
o
v
i
n
ce
in
n
o
r
th
er
n
o
f
T
h
ailan
d
,
as
s
h
o
wn
in
Fig
u
r
e
1
.
T
h
is
lo
ca
tio
n
m
ain
tain
s
an
ab
u
n
d
a
n
ce
o
f
s
to
n
e
an
d
v
a
r
io
u
s
s
to
n
e
ca
r
v
in
g
s
s
u
ch
as
s
to
n
e
m
o
r
tar
an
d
p
e
s
tle.
T
h
e
lif
ec
y
cle
o
f
th
e
s
to
n
e
m
o
r
ta
r
p
r
o
ce
s
s
es
is
s
h
o
wn
in
Fig
u
r
e
2
;
d
ata
co
llectio
n
was d
is
tr
ib
u
ted
b
et
wee
n
in
f
o
r
m
al
wo
r
k
e
r
s
in
th
e
in
d
iv
id
u
al
wo
r
k
f
u
n
ctio
n
s
.
A
cr
o
s
s
-
s
ec
tio
n
al
s
tu
d
y
was
c
o
n
d
u
cte
d
f
r
o
m
Au
g
u
s
t
an
d
Se
p
tem
b
er
2
0
2
3
.
T
h
e
s
tu
d
y
was
ca
r
r
ied
o
u
t
am
o
n
g
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
er
s
wh
o
wer
e
ex
p
o
s
ed
to
h
ig
h
n
o
is
e
lev
els
d
u
r
in
g
th
ei
r
wo
r
k
.
T
h
e
to
tal
o
f
1
6
3
p
ar
ticip
an
ts
b
etwe
en
1
8
to
6
0
y
ea
r
s
o
f
ag
e
wer
e
s
elec
ted
.
Acc
o
r
d
i
n
g
to
a
s
u
r
v
ey
co
n
d
u
cte
d
b
y
th
e
r
esear
ch
er
,
th
e
to
tal
n
u
m
b
e
r
o
f
in
f
o
r
m
al
wo
r
k
er
s
en
g
ag
ed
i
n
s
to
n
e
m
o
r
tar
p
r
o
d
u
ctio
n
in
t
h
e
s
tu
d
ied
ar
ea
s
o
f
L
am
p
an
g
p
r
o
v
i
n
ce
was
esti
m
ated
to
b
e
1
6
3
p
eo
p
le.
T
h
e
r
e
cr
u
itm
en
t
p
r
o
ce
s
s
was
b
ased
o
n
th
e
in
clu
s
io
n
an
d
ex
clu
s
io
n
cr
iter
ia.
T
h
ese
in
clu
s
io
n
an
d
e
x
clu
s
io
n
c
r
iter
ia
f
o
r
th
e
s
tu
d
y
ar
e
s
h
o
wn
in
T
ab
le
1
.
All
p
a
r
t
icip
an
ts
m
u
s
t
h
av
e
a
n
eg
ativ
e
r
esu
lt
f
o
r
C
OVI
D
-
1
9
with
a
s
cr
ee
n
i
n
g
an
tig
e
n
test
k
it
p
r
io
r
to
i
n
ter
v
iew
an
d
n
o
is
e
m
ea
s
u
r
em
en
t.
Stan
d
ar
d
ized
q
u
esti
o
n
n
air
es
wer
e
co
m
p
leted
b
y
f
ac
e
-
to
-
f
ac
e
in
ter
v
iews
with
all
p
ar
ticip
an
ts
.
Dem
o
g
r
ap
h
ic
ch
ar
ac
ter
is
tics
an
d
wo
r
k
i
n
f
o
r
m
atio
n
,
b
asic
h
ea
lth
in
f
o
r
m
atio
n
,
h
ea
lth
b
eh
av
io
r
d
ata,
an
d
p
r
ev
en
tio
n
as
well
a
s
co
n
tr
o
l
o
f
h
ea
r
in
g
lo
s
s
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els
,
wer
e
ass
e
s
s
ed
v
ia
q
u
esti
o
n
n
air
es.
T
h
e
q
u
esti
o
n
n
air
es
wer
e
d
ev
elo
p
ed
b
y
r
ese
ar
ch
er
s
wh
ich
was
ap
p
r
o
v
ed
b
y
3
ex
p
er
ts
b
ef
o
r
e
d
ata
co
llectio
n
with
I
OC
;
0
.
7
0
-
1
.
0
0
.
C
r
o
n
b
ac
h
’
s
alp
h
a
co
ef
f
icien
t
was
u
s
ed
f
o
r
r
eliab
ilit
y
an
aly
s
is
r
eg
ar
d
in
g
k
n
o
wled
g
e,
attitu
d
e,
an
d
p
r
ac
tice
f
o
r
s
u
r
v
eillan
ce
,
p
r
ev
e
n
ti
o
n
,
an
d
co
n
t
r
o
l
o
f
h
ea
r
in
g
lo
s
s
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els
wh
ich
was
0
.
7
.
I
f
C
r
o
n
b
ac
h
’
s
a
lp
h
a
c
o
ef
f
icien
t
0
.
7
o
r
h
ig
h
er
was
an
ac
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1
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I
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Fig
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r
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L
a
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Fig
u
r
e
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to
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2
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itio
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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Hea
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8
8
0
6
F
a
cto
r
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a
s
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ith
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is
k
s
co
r
es a
mo
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to
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ta
r
in
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o
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ke
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p
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ed
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(
Yu
w
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d
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h
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was
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p
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d
Ketsak
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'
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y
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p
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o
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h
[
1
2
]
.
T
h
is
s
tan
d
ar
d
u
s
ed
th
e
p
ar
am
e
ter
s
wh
ich
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clu
d
ed
p
o
te
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tial
h
az
ar
d
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atin
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as
s
h
o
wn
in
T
ab
le
2
,
f
r
eq
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en
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T
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4
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o
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r
o
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ex
p
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r
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le
6
.
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o
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g
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th
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lcu
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e
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ess
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en
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m
eth
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s
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es.
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s
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r
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icien
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ed
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e
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tify
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lu
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f
ac
to
r
s
with
r
is
k
s
co
r
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ef
o
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e
u
s
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r
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is
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ev
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al
k
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m
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n
s
[
1
3
]
wer
e
co
n
s
i
d
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:
t
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lin
ea
r
co
r
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ir
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wo
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ig
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en
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.
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o
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u
ltiv
ar
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ality
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u
ltico
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ian
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f
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I
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d
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ally
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s
wer
e
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o
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g
.
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le
2
.
Po
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r
d
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P
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k
u
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l
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o
t
h
e
r
w
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st
a
t
e
d
.
T
ab
le
3
.
Fre
q
u
en
cy
r
atin
g
F
r
e
q
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l
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1
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e
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t
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y
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f
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w
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mes
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y
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a
r
3
S
o
mew
h
a
t
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q
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t
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y
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f
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w
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4
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r
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y
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r
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2
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R
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r
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h
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r
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i
f
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le
4
.
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lth
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H
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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I
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6
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3.
RE
SU
L
T
S AN
D
DI
SCUS
S
I
O
N
3
.
1
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Resul
t
s
3
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1
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1
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ph
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Evaluation Warning : The document was created with Spire.PDF for Python.
I
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b
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Hea
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2252
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F
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1399
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s
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t
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8
in
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ly
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t
i
o
n
b
a
sed
o
n
t
h
e
a
c
t
i
o
n
l
e
v
e
l
o
f
8
5
d
e
c
i
b
e
l
s A
-
w
e
i
g
h
t
e
d
(
d
B
A
)
a
s a
n
8
-
h
o
u
r
t
i
me
w
e
i
g
h
t
e
d
a
v
e
r
a
g
e
(
TWA
)
.
3
.
1
.
4
.
Ass
o
cia
t
io
n bet
wee
n in
depend
e
nt
v
a
ria
bles
a
nd
ris
k
s
co
re
s
T
ab
le
1
0
s
h
o
ws
th
e
ass
o
ciat
io
n
b
etwe
en
s
ev
en
v
ar
iab
les
an
d
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els.
T
h
ese
v
ar
iab
les
wer
e
a
n
aly
ze
d
b
y
u
s
in
g
Pear
s
o
n
’
s
co
r
r
elatio
n
co
e
f
f
icien
t.
N
o
is
e
lev
els
ev
alu
atio
n
a
n
d
jo
b
p
o
s
itio
n
wer
e
s
h
o
wn
t
h
e
n
eg
ativ
e
co
r
r
elatio
n
.
I
n
ad
d
iti
o
n
,
h
eig
h
t
(
cm
.
)
o
f
p
a
r
ticip
an
ts
,
ea
r
ex
am
in
atio
n
,
wo
r
k
in
g
h
o
u
r
p
e
r
d
a
y
(
h
o
u
r
s
)
,
wo
r
k
in
g
d
a
y
p
e
r
wee
k
(
d
ay
s
)
,
an
d
n
o
is
e
lev
els
(
d
B
A)
in
d
icate
d
th
e
p
o
s
itiv
e
co
r
r
elatio
n
with
r
is
k
s
co
r
es.
E
n
ter
m
u
ltip
le
r
e
g
r
ess
io
n
an
a
ly
s
is
co
v
er
ed
s
ev
en
af
f
ec
ted
v
ar
iab
les
f
r
o
m
t
h
o
s
e
an
aly
s
es.
On
ly
f
o
u
r
in
f
lu
e
n
tial
v
ar
iab
les
wer
e
test
ed
b
y
u
s
i
n
g
e
n
ter
m
u
ltip
le
r
eg
r
ess
io
n
a
n
aly
s
is
as
s
h
o
wn
in
T
ab
le
1
1
.
T
ab
le
1
0
.
Ass
o
ciatio
n
b
etwe
e
n
in
d
ep
e
n
d
en
t
v
ar
iab
les
an
d
r
is
k
s
co
r
es (
n
=
1
6
3
)
I
n
d
e
p
e
n
d
e
n
t
v
a
r
i
a
b
l
e
s
P
e
a
r
so
n
's
c
o
r
r
e
l
a
t
i
o
n
c
o
e
f
f
i
c
i
e
n
t
p
-
v
a
l
u
e
*
H
e
i
g
h
t
(
c
m
.
)
o
f
p
a
r
t
i
c
i
p
a
n
t
s
0
.
2
4
5
0
.
0
0
2
Ea
r
e
x
a
m
i
n
a
t
i
o
n
0
.
1
6
3
0
.
0
3
8
W
o
r
k
i
n
g
h
o
u
r
p
e
r
d
a
y
(
h
o
u
r
s)
0
.
4
7
5
<
0
.
0
0
1
W
o
r
k
i
n
g
d
a
y
p
e
r
w
e
e
k
(
d
a
y
s)
0
.
2
6
0
0
.
0
0
1
N
o
i
se
l
e
v
e
l
s
(
d
B
A
)
0
.
4
0
4
<
0
.
0
0
1
N
o
i
se
l
e
v
e
l
s
e
v
a
l
u
a
t
i
o
n
-
0
.
3
0
9
<
0
.
0
0
1
Jo
b
p
o
s
i
t
i
o
n
-
0
.
3
5
4
<
0
.
0
0
1
*
p
-
v
a
l
u
e
<
0
.
0
5
T
ab
le
1
1
.
I
n
f
lu
e
n
tial v
ar
iab
les
an
d
r
is
k
s
co
r
es
(n
=
1
6
3
)
F
a
c
t
o
r
s
U
n
st
a
n
d
a
r
d
i
z
e
d
c
o
e
f
f
i
c
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e
n
t
s
t
p
-
v
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l
u
e
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S
t
d
.
e
r
r
o
r
C
o
n
st
a
n
t
1
0
.
2
5
5
1
.
6
3
7
6
.
2
6
7
<
0
.
0
0
1
H
e
i
g
h
t
(
c
m
.
)
o
f
p
a
r
t
i
c
i
p
a
n
t
s
0
.
0
2
9
0
.
0
1
0
2
.
8
6
4
0
.
0
0
5
Ea
r
e
x
a
m
i
n
a
t
i
o
n
0
.
4
8
1
0
.
1
8
2
2
.
6
4
0
0
.
0
0
9
W
o
r
k
i
n
g
h
o
u
r
p
e
r
d
a
y
(
h
o
u
r
s)
0
.
3
9
8
0
.
0
5
8
6
.
8
3
7
<
0
.
0
0
1
N
o
i
se
l
e
v
e
l
s
e
v
a
l
u
a
t
i
o
n
0
.
6
7
9
1
.
3
9
0
-
4
.
8
7
4
<
0
.
0
0
1
R
=
0
.
6
1
4
R
2
=
0
.
3
7
7
S
t
d
.
Er
r
o
r
=
1
.
0
8
0
F
=
2
3
.
5
9
8
p
-
v
a
l
u
e
<
0
.
0
0
1
*
p
-
v
a
l
u
e
<
0
.
0
5
3
.
2
.
Dis
cus
s
io
n
T
h
is
s
tu
d
y
in
clu
d
ed
1
6
3
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
e
r
s
in
L
am
p
an
g
,
T
h
ailan
d
.
T
h
er
e
wer
e
s
ev
en
f
ac
to
r
s
ass
o
ciate
d
with
r
is
k
s
c
o
r
es
f
r
o
m
e
x
p
o
s
u
r
e
t
o
h
ig
h
n
o
is
e
lev
els.
T
h
e
en
ter
m
u
ltip
le
r
eg
r
ess
io
n
an
aly
s
is
was
u
s
ed
to
an
aly
ze
d
ata
f
r
o
m
f
o
u
r
in
f
l
u
en
tial
f
ac
to
r
s
.
T
h
ese
in
f
lu
en
tial
f
ac
t
o
r
s
in
clu
d
ed
h
ei
g
h
t
(
c
m
.
)
o
f
p
ar
ticip
an
ts
,
ea
r
ex
am
in
ati
o
n
,
wo
r
k
in
g
h
o
u
r
p
er
d
ay
(
h
o
u
r
s
)
,
an
d
n
o
is
e
le
v
els
ev
alu
atio
n
i
n
th
e
wo
r
k
p
lace
.
A
f
ew
p
r
ev
io
u
s
s
tu
d
ies
h
av
e
r
ep
o
r
ted
a
p
o
s
itiv
e
co
r
r
elatio
n
b
etwe
en
th
e
h
eig
h
t
o
f
p
ar
ticip
a
n
ts
an
d
r
is
k
s
co
r
es
f
r
o
m
e
x
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
l
ev
els
[
16
]
.
Fo
r
e
x
am
p
le,
s
o
u
n
d
wav
e
m
o
v
es
th
r
o
u
g
h
air
,
w
h
ich
is
a
m
e
d
iu
m
.
W
h
en
p
ass
in
g
f
r
o
m
o
n
e
m
ed
i
u
m
to
a
n
o
th
er
f
r
o
m
th
e
s
o
u
n
d
s
o
u
r
ce
,
th
e
s
p
ee
d
o
f
s
o
u
n
d
c
h
an
g
es
ac
co
r
d
in
g
t
o
th
e
m
ed
iu
m
an
d
tem
p
er
at
u
r
e.
T
h
er
ef
o
r
e,
wh
e
n
wo
r
k
er
s
wer
e
v
er
y
tall,
th
ey
wer
e
m
o
r
e
ex
p
o
s
ed
to
n
o
is
e
th
an
wo
r
k
er
s
wh
o
wer
e
less
tall.
Als
o
,
m
an
y
p
r
ev
i
o
u
s
s
tu
d
ie
s
r
ep
o
r
te
d
th
at
ea
r
ex
am
in
at
io
n
was
p
o
s
itiv
ely
co
r
r
elate
d
with
r
is
k
s
co
r
es
f
r
o
m
e
x
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els.
Fo
r
in
s
tan
ce
,
a
s
tu
d
y
e
x
am
in
in
g
th
e
r
elatio
n
s
h
ip
b
etwe
en
o
cc
u
p
ati
o
n
al
n
o
is
e
ex
p
o
s
u
r
e
a
n
d
ea
r
a
b
n
o
r
m
alities
am
o
n
g
wo
r
k
er
s
f
o
u
n
d
a
s
ig
n
if
ican
t
co
r
r
elatio
n
b
etwe
en
elev
ated
n
o
is
e
lev
e
ls
an
d
th
e
o
cc
u
r
r
e
n
ce
o
f
ea
r
-
r
elate
d
h
ea
lth
is
s
u
es.
T
h
e
m
o
s
t
r
ep
o
r
ted
s
y
m
p
to
m
s
in
a
f
f
ec
ted
i
n
d
iv
id
u
als
in
clu
d
ed
h
ea
d
ac
h
es,
s
tr
ess
,
d
if
f
icu
lties
in
co
m
m
u
n
icati
o
n
,
tin
n
itu
s
,
r
ed
u
ce
d
co
n
ce
n
tr
atio
n
,
an
d
d
izzin
ess
[
1
7
]
.
I
n
ad
d
itio
n
,
Z
aw
et
a
l.
[
18
]
s
tated
th
at
wo
r
k
er
s
with
a
h
is
to
r
y
o
f
ea
r
in
ju
r
ies
wer
e
ap
p
r
o
x
im
ately
5
.
6
3
tim
e
s
m
o
r
e
lik
ely
to
b
e
at
r
is
k
f
o
r
ch
an
g
es
in
th
eir
h
ea
r
in
g
lev
e
ls
f
r
o
m
o
cc
u
p
atio
n
th
an
wo
r
k
e
r
s
with
n
o
h
is
to
r
y
o
f
ea
r
in
ju
r
ies.
On
th
e
o
th
er
h
an
d
,
a
s
tu
d
y
b
y
T
a
m
b
s
et
a
l.
[
19
]
f
o
u
n
d
th
at
wo
r
k
er
s
with
c
o
n
g
e
n
ital
d
is
o
r
d
er
s
an
d
a
h
is
to
r
y
o
f
ea
r
in
ju
r
ies
m
ay
b
e
at
in
c
r
ea
s
ed
r
is
k
f
o
r
o
cc
u
p
atio
n
ally
in
d
u
ce
d
c
h
an
g
es
i
n
h
ea
r
i
n
g
th
r
esh
o
ld
s
.
Ho
wev
er
,
th
is
s
tu
d
y
was
n
o
t
s
tatis
tically
s
ig
n
if
ican
t
at
th
e
9
5
%
co
n
f
id
en
ce
lev
el.
Als
o
r
ep
o
r
te
d
th
at
w
o
r
k
in
g
h
o
u
r
s
p
er
d
ay
wer
e
p
o
s
itiv
ely
c
o
r
r
elate
d
with
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els.
Fo
r
in
s
tan
ce
,
in
d
iv
id
u
als
ex
p
o
s
ed
to
o
cc
u
p
atio
n
al
n
o
is
e
f
o
r
m
o
r
e
th
an
8
h
o
u
r
s
p
er
d
ay
ar
e
at
an
in
c
r
ea
s
ed
r
i
s
k
o
f
ex
p
er
ien
ci
n
g
ch
an
g
es
in
h
ea
r
in
g
lev
els
co
m
p
ar
ed
to
th
o
s
e
with
s
h
o
r
ter
d
u
r
atio
n
s
o
f
n
o
is
e
ex
p
o
s
u
r
e
[
2
0
]
.
On
th
e
o
th
er
h
an
d
,
th
er
e
w
er
e
s
tu
d
ies
th
at
f
o
u
n
d
th
at
wo
r
k
in
g
h
o
u
r
s
p
er
d
ay
(
h
o
u
r
s
)
a
n
d
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
n
o
is
e
lev
els
wer
e
n
o
t
s
ig
n
if
ican
tly
r
elate
d
at
t
h
e
9
5
%
co
n
f
id
en
ce
lev
el
[
8
]
,
[
2
1
]
.
C
o
n
v
er
s
ely
,
n
o
is
e
lev
els
ev
alu
atio
n
was
f
o
u
n
d
to
b
e
n
eg
ativ
ely
co
r
r
elate
d
with
r
is
k
s
co
r
es
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J Pu
b
lic
Hea
lth
Sci
I
SS
N:
2252
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8
8
0
6
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a
cto
r
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a
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w
ith
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k
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co
r
es a
mo
n
g
s
to
n
e
mo
r
ta
r
in
f
o
r
ma
l wo
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r
s
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p
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(
Yu
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K
h
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1401
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8
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f
h
ea
r
in
g
lo
s
s
in
o
n
e
ea
r
at
th
e
9
5
%
co
n
f
i
d
en
ce
lev
el.
I
t
was
also
f
o
u
n
d
th
at
n
o
is
e
ex
p
o
s
u
r
e
lev
els
g
r
ea
ter
t
h
an
9
0
d
B
A
s
ig
n
if
ican
tly
in
cr
ea
s
ed
th
e
p
r
ev
alen
ce
o
f
h
ea
r
in
g
lo
s
s
in
b
o
th
ea
r
s
at
th
e
9
5
%
co
n
f
id
en
ce
lev
el
[
8
]
,
[
22
]
co
n
d
u
cted
a
s
tu
d
y
ev
alu
atin
g
ch
an
g
es
in
h
ea
r
in
g
lo
s
s
b
ased
o
n
au
d
io
m
e
tr
ic
test
o
f
wo
r
k
er
s
i
n
th
e
weld
in
g
in
d
u
s
tr
y
i
n
2
0
0
8
an
d
2
0
0
9
in
I
r
an
.
I
t
was
f
o
u
n
d
th
at
b
o
th
ea
r
s
ex
p
o
s
ed
to
h
ig
h
n
o
is
e
lev
els
g
r
ea
ter
th
an
9
0
d
B
A
wer
e
ap
p
r
o
x
im
ately
2
.
7
5
to
1
1
.
5
5
tim
es
m
o
r
e
at
r
is
k
o
f
h
ea
r
in
g
lo
s
s
th
an
h
ig
h
n
o
is
e
lev
els
8
5
–
9
0
d
B
A.
Fu
r
th
e
r
m
o
r
e,
th
er
e
wer
e
m
an
y
s
tu
d
ies
in
r
elatin
g
t
o
h
i
g
h
n
o
is
e
lev
els
an
d
h
ea
r
in
g
lo
s
s
in
T
h
ailan
d
.
Fo
r
ex
a
m
p
le,
th
e
r
elatio
n
s
h
ip
b
etwe
en
ex
p
o
s
u
r
e
to
n
o
is
e
lev
els
in
th
e
wo
r
k
ar
ea
an
d
h
ea
r
i
n
g
l
o
s
s
am
o
n
g
wo
r
k
e
r
s
p
r
o
d
u
cin
g
a
ir
co
n
d
itio
n
in
g
p
ar
ts
a
n
d
r
ef
r
i
g
er
atio
n
e
q
u
ip
m
e
n
t
f
o
u
n
d
th
at
n
o
is
y
wo
r
k
in
g
en
v
i
r
o
n
m
en
t
wer
e
s
ig
n
if
ican
tly
as
s
o
ciate
d
with
h
ea
r
in
g
l
o
s
s
at
th
e
9
5
%
co
n
f
id
en
ce
lev
el
[
2
3
]
.
T
h
e
r
e
wer
e
also
s
tu
d
ies
to
co
n
f
i
r
m
th
e
r
elatio
n
s
h
i
p
b
etwe
en
n
o
is
e
lev
els
in
wo
r
k
ar
ea
s
an
d
h
ea
r
i
n
g
lo
s
s
,
s
u
ch
as
s
tu
d
ies
b
y
[
24
]
-
[
26
].
Ho
wev
er
,
th
er
e
wer
e
f
e
w
s
tu
d
ies
o
n
f
ac
to
r
s
r
elate
d
t
o
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els.
T
h
er
ef
o
r
e,
th
is
is
th
e
f
ir
s
t
r
ep
o
r
t
o
n
in
f
lu
en
tial
f
ac
to
r
s
o
f
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
h
ig
h
n
o
is
e
lev
els
am
o
n
g
s
to
n
e
m
o
r
tar
i
n
f
o
r
m
a
l
wo
r
k
er
s
i
n
T
h
ailan
d
.
T
h
ese
f
in
d
in
g
s
wo
u
l
d
b
e
v
er
y
u
s
ef
u
l
f
o
r
p
r
ev
en
tin
g
an
d
co
n
tr
o
llin
g
m
ea
s
u
r
es
th
at
in
f
lu
en
ce
f
ac
to
r
s
,
s
ettin
g
p
o
licies
an
d
s
tr
ateg
ies
to
m
itig
ate
th
e
r
is
k
s
f
o
r
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
er
s
an
d
th
e
o
th
er
e
x
p
o
s
ed
p
o
p
u
latio
n
.
An
o
th
er
p
o
s
s
ib
le
lim
it
atio
n
in
th
is
s
tu
d
y
was
r
el
ativ
ely
s
h
o
r
t,
in
clu
d
in
g
a
lim
ited
n
u
m
b
e
r
o
f
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
er
s
an
d
s
am
p
les,
an
d
th
e
r
esu
lts
m
ay
th
er
ef
o
r
e
n
o
t
b
e
g
en
er
alize
d
ac
r
o
s
s
th
e
en
tire
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
e
r
s
’
p
o
p
u
latio
n
.
4.
CO
NCLU
SI
O
N
W
o
r
k
in
g
with
h
ig
h
n
o
is
e
lev
els
r
eq
u
ir
ed
im
p
o
r
ta
n
t
m
ea
s
u
r
es
to
r
ed
u
ce
e
x
p
o
s
u
r
e
.
Me
asu
r
es
g
en
er
ally
in
cl
u
d
ed
wea
r
in
g
a
h
ea
r
in
g
p
r
o
tectio
n
,
im
p
lem
en
tin
g
d
esig
n
d
ev
ices
to
r
ed
u
ce
n
o
is
e,
n
o
is
e
p
ar
titi
o
n
,
n
o
is
e
co
m
p
a
r
tm
en
t,
in
cr
ea
s
in
g
th
e
d
is
tan
ce
b
etwe
en
n
o
is
e
s
o
u
r
ce
an
d
wo
r
k
er
s
,
m
ain
ten
an
ce
o
f
eq
u
ip
m
en
t
a
n
d
to
o
ls
,
an
d
av
o
i
d
in
g
ac
tiv
ities
th
at
g
en
er
ate
e
x
ce
s
s
iv
e
n
o
is
e
lev
els.
R
eg
u
lar
ch
ec
k
u
p
s
wer
e
also
im
p
o
r
tan
t
to
m
o
n
ito
r
th
eir
h
ea
lth
f
o
r
s
ig
n
s
o
f
h
ea
r
in
g
lo
s
s
.
Facto
r
s
ass
o
ciate
d
with
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
n
o
is
e
lev
e
ls
,
esp
ec
ially
t
h
e
wo
r
k
er
'
s
h
eig
h
t
f
ac
to
r
was
f
o
u
n
d
f
o
r
th
e
f
ir
s
t
tim
e
in
t
h
is
s
tu
d
y
.
T
h
is
in
f
l
u
en
tial
f
ac
to
r
r
elatin
g
to
th
e
r
is
k
s
co
r
es
f
r
o
m
ex
p
o
s
u
r
e
to
n
o
is
e
lev
els
in
th
e
wo
r
k
in
g
a
r
ea
to
g
eth
er
with
o
th
er
f
ac
to
r
s
s
u
ch
as
ea
r
ex
am
i
n
atio
n
,
w
o
r
k
in
g
h
o
u
r
p
e
r
d
a
y
(
h
o
u
r
s
)
,
an
d
n
o
is
e
lev
els
ev
al
u
atio
n
.
T
h
er
ef
o
r
e,
t
h
ese
in
f
lu
en
tial
f
ac
to
r
s
ar
e
u
s
ef
u
l
i
n
s
ettin
g
p
r
o
ac
tiv
e
m
ea
s
u
r
es
am
o
n
g
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
er
s
ex
p
o
s
ed
to
h
ig
h
n
o
is
e
lev
els.
Mo
r
eo
v
er
,
th
ese
in
f
lu
e
n
tial
f
ac
to
r
s
will
also
cr
ea
te
th
e
m
o
d
el
an
d
w
eb
ap
p
licatio
n
f
o
r
s
cr
ee
n
in
g
th
e
r
is
k
f
r
o
m
ex
p
o
s
u
r
e
to
h
i
g
h
n
o
is
e
lev
els
.
ACK
NO
WL
E
DG
E
M
E
NT
S
T
h
e
au
th
o
r
s
wo
u
ld
lik
e
to
a
ck
n
o
wled
g
e
t
h
e
s
to
n
e
m
o
r
tar
in
f
o
r
m
al
wo
r
k
er
s
wh
o
p
ar
ti
cip
ated
in
th
is
s
tu
d
y
.
F
UNDING
I
NF
O
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M
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T
h
is
r
esear
ch
p
r
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s
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ted
b
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e
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h
ai
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Pro
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5
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9
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3
.
DATA AV
AI
L
AB
I
L
I
T
Y
T
h
e
d
ata
s
u
p
p
o
r
tin
g
th
e
f
in
d
in
g
s
o
f
th
is
s
tu
d
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e
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e
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d
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r
estrictio
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s
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RE
F
E
R
E
NC
E
S
[
1
]
N
a
t
i
o
n
a
l
S
t
a
t
i
st
i
c
a
l
O
f
f
i
c
e
T
h
a
i
l
a
n
d
(
N
S
O
)
,
“
Th
e
i
n
f
o
r
ma
l
e
m
p
l
o
y
me
n
t
s
u
r
v
e
y
2
0
2
2
.
”
A
c
c
e
ss
e
d
:
D
e
c
.
2
0
,
2
0
2
2
.
[
O
n
l
i
n
e
]
.
A
v
a
i
l
a
b
l
e
:
h
t
t
p
s:
/
/
w
w
w
.
n
s
o
.
g
o
.
t
h
/
n
s
o
w
e
b
/
n
s
o
/
s
t
a
t
i
s
t
i
c
a
l
_
s
y
st
e
m?s
e
t
_
l
a
n
g
=
e
n
[
2
]
W
o
r
l
d
H
e
a
l
t
h
O
r
g
a
n
i
z
a
t
i
o
n
(
W
H
O
)
,
“
W
H
O
d
i
r
e
c
t
o
r
-
g
e
n
e
r
a
l
’
s
o
p
e
n
i
n
g
r
e
mark
s
a
t
t
h
e
l
a
u
n
c
h
o
f
t
h
e
w
o
r
l
d
r
e
p
o
r
t
o
n
h
e
a
r
i
n
g
.
”
A
c
c
e
ss
e
d
:
N
o
v
.
1
0
,
2
0
2
3
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5
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th
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