Table 4
Relative risks (95% CI) for baseline prevalence, prevalence (repeated measures) on two surveys, and one-year cumulative incidence of UE MSD cases on physical examination, among non-cases at baseline; workers with exposure ratings on both surveys, two automobile manufacturing plants, Detroit, MI
| Prevalence | Cumulative incidence | ||
|---|---|---|---|
| Baseline only (n = 714) | Both surveys: repeated measures (n = 1855)* | Follow up survey (n = 470) | |
| *GEE log-link model also included terms for year of survey (p = 0.81) and interaction of exposure index × year (p = 0.20). | |||
| Ergonomic exposure index (quartiles) | 1.3 (1.1 to 1.5) | 1.3 (1.2 to 1.4) | 1.2 (0.9 to 1.6) |
| UE injury (yes/no) | 1.2 (0.9 to 1.6) | 1.1 (1.0 to 1.3) | 1.4 (0.8 to 2.3) |
| Gender (male/female) | 1.7 (1.2 to 2.2) | 1.6 (1.4 to 1.9) | 2.0 (1.1 to 3.6) |
| Systemic disease (yes/no) | 1.4 (1.1 to 1.9) | 1.4 (1.2 to 1.6) | 1.0 (0.5 to 1.9) |
