Comparison of low back pain risk estimates (odds ratios) for different exposure/dose metrics from a case–control study among automobile assembly workers
| Peak vs cumulative measure | Exposure/dose metric | Odds ratio* | 95% CI |
|---|---|---|---|
| *Odds ratios compare risk for the 75th versus the 25th percentiles of the distribution of the exposure/dose measure. | |||
| †Peak exposure expressed as percentage of the maximum voluntary extensor moment (gender specific). | |||
| Exposure is extensor moment at L4/L5. Dose metric from a first order system with recovery time constant (?) of 2 or 5000 seconds (adapted from Krajcarski et al29). | |||
| Peak | Exposure (% MVE)† | 1.5 | (1.0 to 2.6) |
| Dose metric (τ = 2 s) | 2.2 | (1.1 to 4.7) | |
| Cumulative | Exposure (N·m·s/shift) | 1.9 | (1.0 to 3.9) |
| Dose metric (τ = 5000 s) | 1.9 | (1.1 to 3.8) | |