Cumulative incidence of upper extremity disorders on physical examination; risk ratios (95% CI) from multivariate Cox regression models; automotive stamping and engine plant workers, Detroit, MI, 1993–94
| Model 1 | Model 2 | |
|---|---|---|
| All workers at risk (n = 459) | Workers with no job change during follow up period (n = 335) | |
| Exposure index quartile (1–4) | 1.5 (1.0 to 2.2) | 1.5 (1.1 to 2.2) |
| Gender (female/male) | 1.4 (0.7 to 2.7) | 1.1 (0.4 to 3.0) |
| Upper extremity injury (yes/no) | 1.4 (0.8 to 2.4) | 1.8 (0.9 to 3.5) |
| Baseline physical examination findings (yes/no) | 1.7 (1.0 to 3.0) | 1.6 (0.8 to 3.2) |
| High demand/low control (yes/no) | 1.5 (0.8 to 2.8) | 1.7 (0.8 to 3.6) |
| High body mass index (≥26 v <26) | 1.5 (0.9 to 2.7) | 1.6 (0.8 to 3.2) |
| Job change at follow up (yes/no) | 4.8 (1.5 to 15.4) | – |
| Exposure score × job change | 0.5 (0.2 to 0.9) | – |
| Model p value from likelihood ratio test | 0.01 | 0.02 |