Number of respondents of the questionnaire survey, mean age, years of employment in current job, and number of working hours per week for three exposure groups with respect to pushing and pulling over 50 kg
| Reference group | Medium exposed group | High exposed group | |
|---|---|---|---|
| Number of participants | 188 | 252 | 182 |
| Men | 94 | 129 | 166 |
| Women | 94 | 123 | 16 |
| Age in years (SD) | 41.1 (9.1) | 38.0 (9.5) | 41.2 (8.4) |
| Years of employment in current job (SD) | 10.7 (7.3) | 8.6 (6.6) | 13.9 (7.9) |
| Working hours per week (SD) | 35 (10) | 34 (11) | 38 (4) |