Table 2 PMVC Incidence Rate Ratios (IRR) and 95% Confidence Intervals for Intervention and Comparator Streets, Stratified by Collision Characteristics
Characteristics | Intervention Streets (n = 382 PMVC) | Comparator Streets (n = 292 PMVC) | ||
|---|---|---|---|---|
Total n (%) | IRRa (95% CI) | Total n (%) | IRRa (95% CI) | |
Ages | ||||
Child (0 to 15) | 50 (13.1%) | 0.72 (0.41–1.29) | 43 (14.7%) | 0.79 (0.40–1.57) |
Adult (16 to 59) | 235 (61.5%) | 0.71 (0.55–0.92) | 187 (64.0%) | 0.99 (0.71–1.38) |
Older Adult (Over 60) | 89 (23.3%) | 0.79 (0.51–1.23) | 60 (20.5%) | 0.87 (0.51–1.49) |
Unknown | 8 (2.1%) | – | 2 (0.68%) | – |
Injury Severity | ||||
None | 18 (4.7%) | 0.51 (0.18–1.45) | 10 (3.4%) | 0.25 (0.05–1.32) |
Minimal and Minor | 330 (86.4%) | 0.78 (0.62–0.98) | 238 (81.5%) | 1.03 (0.75–1.42) |
Major and Fatal | 34 (8.9%) | 0.33 (0.13–0.85) | 44 (15.1%) | 0.69 (0.37–1.31) |
Location | ||||
Intersection | 310 (81.2%) | 0.62 (0.48–0.79) | 255 (87.3%) | 0.92 (0.68–1.24) |
Midblock | 64 (16.7%) | 1.01 (0.64–1.60) | 31 (10.6%) | 0.72 (0.33–1.59) |
Other | 8 (2.1%) | – | 6 (2.1%) | – |
Traffic Controls | ||||
No Control | 171 (44.8%) | 0.63 (0.45–0.87) | 73 (25.0%) | 0.87 (0.49–1.54) |
Any Traffic Controls | 210 (55.0%) | 0.78 (0.60–1.03) | 219 (75.0%) | 0.95 (0.67–1.33) |
Unknown | 1 (0.2%) | – | ||
Visibility | ||||
Clear | 319 (83.5%) | 0.69 (0.54–0.87) | 257 (88.0%) | 0.98 (0.71–1.34) |
Rain, Snow or Other | 63 (16.5%) | 0.88 (0.54–1.41) | 35 (12.0%) | 0.66 (0.33–1.36) |
Lighting | ||||
Daylight | 258 (67.5%) | 0.69 (0.53–0.90) | 181 (62.0%) | 0.83 (0.57–1.21) |
Dawn, Dusk & Dark | 124 (32.5%) | 0.77 (0.53–1.12) | 111 (38.0%) | 1.13 (0.74–1.72) |
Road Surface | ||||
Dry | 286 (74.9%) | 0.73 (0.56–0.94) | 233 (80.0%) | 1.01 (0.72–1.40) |
Other | 96 (25.1%) | 0.68 (0.46–1.00) | 59 (20.0%) | 0.68 (0.40–1.16) |