Study type:
Epidemiological study
(observational study)
Occupational Magnetic Field Exposure and Neurodegenerative Disease
epidem.
By:
Feychting M, Jonsson F, Pedersen NL, Ahlbom A
Published in: Epidemiology 2003; 14 (4): 413-419
Aim of study (acc. to author)
Endpoint/type of risk estimation
Type of risk estimation:
(relative risk (RR))
Exposure
Assessment
Exposure groups
|
Group
|
Description
|
|
Group 1
|
≤ 0.11 µT
|
|
Group 2
|
0.12 - 0.19 µT
|
|
Group 3
|
0.20 - 0.29 µT
|
|
Group 4
|
≥ 0.30 µT
|
|
Group 5
|
≥ 0.50 µT
|
Population
-
Group:
-
Age:
16–98 years
-
Characteristics:
Economically active individuals in 1970 or 1980 and alive on 1.1.1981
-
Observation period:
1981 - 1995 or until death (follow-up)
-
Study location:
Sweden
-
Data source:
Swedish census, death certificate
Study size
| Type |
Value |
| Total |
4,812,646 |
| Evaluable |
21,050 |
Statistical analysis method:
- Cox proportional regressions analysis
(
adjustment:
)
Results (acc. to author)
Limitations (acc. to author)
Using death certificates there is no information available about the date of disease onset. Furthermore, missclassification is a problem because neurodegenerative diseases are not always mentioned on the death certificate. Information about occupation was only available for the years 1970 and 1980.
Study funded by
-
Swedish Council for Working Life and Social Research (FAS)
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