Summary of baseline biomechanical and work psychosocial exposures
| N | Mean (SD) | |
| Force measures | ||
| Peak Borg CR-10: Worker’s rating (0–10 scale) | 346 | 3.9 (2.2) |
| Peak Borg CR-10: Analyst’s rating (0–10 scale) | 365 | 3.0 (1.7) |
| Repetition measures | ||
| Hand Activity Level Scale: Analyst’s rating (0–10 scale) | 367 | 4.9 (1.7) |
| Total repetition rate* (reps/min) | 363 | 21.6 (15.7) |
| Forceful repetition rate* (reps/min) | 363 | 7.7 (10.1) |
| Dty cycle | ||
| % duration all exertions* (0%–100%) | 363 | 67.1 (18.4) |
| % duration forceful exertions* (0%–100%) | 363 | 22.4 (19.4) |
| Posture measures | ||
| % time ≥30° wrist flexion* (0%–100%) | 360 | 4.2 (9.1) |
| % time ≥30° wrist extension* (0%–100%) | 360 | 13.8 (20.6) |
| Work psychosocial measures | ||
| Psychological demand† | 182 | 31.9 (4.9) |
| Decision latitude† | 180 | 60.0 (8.5) |
| Other measures | N | % |
| Vibration | ||
| None | 190 | 54.6 |
| Some | 158 | 45.4 |
| 2018 ACGIH TLV for hand activity | ||
| Lower tertile (<PFIAL) | 72 | 19.8 |
| Middle tertile (≥PFIAL and < PFITLV) | 86 | 23.7 |
| Upper tertile (≥PFITLV) | 205 | 56.5 |
*Direct measurements and/or from videotape analyses.
†Domain of the Karasek Job Strain Index.
ACGIH, American Conference of Governmental Industrial Hygienists; PFIAL, PFI action limit; PFITLV, Peak Force Index threshold limit value.