sociodemographic factors
|
matching variables and basic description
|
distribution
|
[39]
|
musculoskeletal symptoms
|
description of health status
|
health status
|
[40]
|
frequency and duration of e.g. kneeling, squatting, lifting and carrying
|
occupational exposure
|
cumulative effects
|
[35, 41, 42 and own development]
|
diseases & injuries, drinking alcohol, smoking
|
possible confounding factors
|
cumulative effects
|
[35, 41, 42 and own development]
|
frequency and duration of sports
|
possible confounding factors
|
cumulative effects
| |
frequency and duration of leisure time activities
|
possible confounding factors
|
cumulative effects
| |
questions on hormone balance/imbalance
|
possible confounding factors
|
cumulative effects
|
[41]
|
questions on knee status
|
selection variables
| |
[35]
|
knee status: grade & localities of knee OA, secondary disorders and kind of diagnostics
|
to be compared with occupational tasks
| |
[own development]
|