Baseline characteristics of participants and non-participants
| Participants with no missing data during follow-up | Participants with missing data during follow-up* | Non-participants | ||||
| n | %/mean (SD) | n | %/mean (SD) | n | %/mean (SD) | |
| Mean company tenure (years) | 1010 | 12.5 (10.6) | 937 | 9.9 (9.8) | 2926 | 10.9 (9.9) |
| Mean job contract (h/week) | 1010 | 34.5 (7.3) | 937 | 33.9 (7.3) | 2926 | 34.3 (6.7) |
| Mean recorded duration of computer use at work (h/week) | 272 | 12.4 (4.0) | 189 | 11.8 (4.4) | 1017 | 11.0 (5.6) |
| Self-reported duration of computer use at work (h/day) | ||||||
| 0 to <4 | 147 | 15 | 129 | 14 | –† | –† |
| 4 to <6 | 428 | 42 | 351 | 37 | ||
| ≥6 | 437 | 43 | 458 | 49 | ||
| Individual characteristics | ||||||
| Age (years) | 1006 | 41.4 (9.6) | 915 | 38.9 (9.8) | 2926 | 39.6 (9.3) |
| Female gender | 1013 | 43.4 | 938 | 52.7 | 2926 | 44.5 |
| Prevalent neck–shoulder symptoms in past 3 months | 1013 | 12.8 | 938 | 17.2 | –† | –† |
| Prevalent arm–wrist–hand symptoms in past months | 1013 | 9.7 | 938 | 11.4 | –† | –† |
| Disability owing to neck–shoulder symptoms in past year | 1013 | 26.1 | 938 | 26.3 | –† | –† |
| Disability owing to arm–wrist–hand symptoms in past year | 1013 | 18.8 | 938 | 21.2 | –† | –† |