the sampling method, and the design for Studies 1-5.
 |
||||||
| Study |
N
|
Age
(years), mean (SD) range
|
Occupation
|
Participation
rate, %
|
Entrance
to the study
|
Study
design
|
|
||||||
| 1 |
69
|
41.7
(7.7)
33-56 |
Firefighter
|
87
|
Stratified
sampling
|
Cross-sectional
|
|
52
|
39.9
(8.7)
23-56 |
Construction
worker
|
84
|
All
from one occupational health care unit
|
Cross-sectional
|
|
|
51
|
41.9
(10.5)
26-61 |
Nursing
staff
|
85
|
Stratified
sampling
|
Cross-sectional
|
|
|
66
|
46.2
(8.5)
28-61 |
Home
care worker
|
88
|
All
from 10 work units
|
Cross-sectional
|
|
| 2,
3, 5 |
29
|
42.3
(7.7)
33-56 |
Firefighter
|
97
|
Volunteers
|
Cross-sectional
(2, 3) Longitudinal (5) |
| 4 |
135
|
40.7
(7.5)
30-54 |
Firefighter
|
82
|
Stratified
sampling
|
Longitudinal
|
|
||||||