Estimated relative risk, 95% confidence intervals, and population attributable risk (PAR) of alcohol for crashes, US transit industry, 1995–2000
| Year | Type of testing | Proportion testing positive* | Estimated RR (95% CI) | PAR | PAR% | Number attributable per 1000 crashes |
|---|---|---|---|---|---|---|
| *Proportion testing positive from 1995–2000 Drug and Alcohol Testing Results Annual Reports. | ||||||
| 1995 | Post crash | 0.0020 (n = 13/6533) | 1.16 (0.65 to 2.08) | 0.0003 (−0.0006 to 0.0018) | 0.03% (−0.06% to 0.18%) | 0.3 (−0.6 to 1.8) |
| Random | 0.0017 (n = 82/47816) | |||||
| 1996 | Post crash | 0.0014 (n = 16/11299) | 0.88 (0.52 to 1.49) | – | – | – |
| Random | 0.0016 (n = 101/62618) | |||||
| 1997 | Post crash | 0.0013 (n = 18/13482) | 0.98 (0.55 to 1.75) | – | – | – |
| Random | 0.0014 (n = 85/62161) | |||||
| 1998 | Post crash | 0.0012 (n = 15/12871) | 0.89 (0.75 to 1.05) | – | – | – |
| Random | 0.0013 (n = 54/41206) | |||||
| 1999 | Post crash | 0.0011 (n = 16/14651) | 1.16 (0.65 to 2.07) | 0.00016 (−0.00035 to 0.00107) | 0.02% (−0.04% to 0.11%) | 0.16 (−0.35 to 1.07) |
| Random | 0.0010 (n = 39/41358) | |||||
| 2000 | Post crash | 0.0004 (n = 5/13783) | 0.35 (0.14 to 0.89) | – | – | – |
| Random | 0.0010 (n = 42/41002) | |||||