Table 1.
Trip-Based, Distance-Based, Time-Based, and Density-Based Relative Crash Risks Among Men and Women, United States, 2002–2012
| Age Group, years | Trip-Based Crash Risk | Distance-Based Crash Risk | Time-Based Crash Risk | Density-Based Crash Risk | ||||
|---|---|---|---|---|---|---|---|---|
| RRa | 95% CI | RRa | 95% CI | RRa | 95% CI | RRa | 95% CI | |
| Men | ||||||||
| 16–20 | 2.97 | 2.82, 3.14 | 3.90 | 3.67, 4.11 | 3.77 | 3.59, 3.97 | 2.88 | 2.75, 3.03 |
| 21–29 | 2.38 | 2.24, 2.52 | 2.07 | 1.95, 2.20 | 2.26 | 2.14, 2.40 | 2.72 | 2.58, 2.87 |
| 30–39 | 1.27 | 1.20, 1.34 | 1.13 | 1.06, 1.20 | 1.25 | 1.19, 1.33 | 1.40 | 1.33, 1.48 |
| 40–49 | 1.14 | 1.08, 1.21 | 1.04 | 0.98, 1.10 | 1.13 | 1.07, 1.19 | 1.24 | 1.17, 1.30 |
| 50–59 | 1.14 | 1.05, 1.22 | 1.05 | 0.98, 1.12 | 1.10 | 1.03, 1.17 | 1.19 | 1.11, 1.27 |
| 60–69 | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| ≥70 | 1.30 | 1.22, 1.38 | 1.73 | 1.62, 1.83 | 1.44 | 1.36, 1.53 | 1.09 | 1.03, 1.15 |
| Women | ||||||||
| 16–20 | 2.83 | 2.71, 2.94 | 2.86 | 2.75, 2.98 | 3.10 | 2.97, 3.24 | 3.07 | 2.95, 3.20 |
| 21–29 | 1.65 | 1.57, 1.73 | 1.32 | 1.26, 1.39 | 1.55 | 1.47, 1.63 | 1.93 | 1.84, 2.03 |
| 30–39 | 1.00 | 0.95, 1.04 | 0.91 | 0.87, 0.95 | 1.04 | 0.99, 1.08 | 1.14 | 1.09, 1.19 |
| 40–49 | 0.93 | 0.89, 0.98 | 0.86 | 0.83, 0.90 | 0.95 | 0.91, 1.00 | 1.03 | 0.98, 1.07 |
| 50–59 | 0.97 | 0.92, 1.02 | 0.87 | 0.82, 0.92 | 0.94 | 0.88, 0.99 | 1.04 | 0.98, 1.10 |
| 60–69 | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent | 1.00 | Referent |
| ≥70 | 1.54 | 1.45, 1.63 | 2.08 | 1.97, 2.19 | 1.64 | 1.55, 1.73 | 1.22 | 1.16, 1.29 |
Abbreviations: CI, confidence interval; RR, relative risk.
a Relative risk was estimated using beta regression analysis.