Risk factors for developing asthma presumed to be induced by TDI (analysis based on conditional logistic regression with backward elimination)
| Explanatory variables3-150 | Risk ratio | 95% CI |
| Earlier exposure to TDI (yes=1, no=0) | 3.1 | 1.1 to 9.0 |
| Earlier exposure to phosgene (yes=1, no=0) | 4.3 | 1.3 to 15.7 |
| Current cigarette smoking (packs/day) | 0.4 | 0.1 to 1.0 |
| Duration of exposure (y) | 0.8 | 0.7 to 0.9 |
↵3-150 Three variables, intensity of exposure to TDI (8-h TWA), earlier exposure by inhalation to any respiratory irritant other than TDI, and sex were NS at p<0.05.