The influence of speed humps on traffic injuries adjusting for other covariates
| Variables | Before | After | ||
| cOR (95% CI) | aOR (95% CI) | cOR (95% CI) | aOR (95% CI) | |
| Groups | ||||
| Control sites | 1 | 1 | 1 | 1 |
| Intervention sites | 1.06 (0.73 to 1.55) | 1.35 (0.84 to 2.12) | 0.60* (0.41 to 0.90) | 0.23* (0.11 to 0.47) |
| Age group (years) | ||||
| 1–15 | 1 | 1 | 1 | |
| 16–30 | 2.57 (0.86 to 7.66) | 1.58 (0.44 to 5.73) | 1.39 (0.64 to 3.00) | 1.27 (0.40 to 4.05) |
| 31–45 | 2.63 (0.89 to 7.78) | 1.87 (0.52 to 6.74) | 1.61 (0.76 to 3.43) | 1.27 (0.40 to 4.09) |
| 45+ | 2.93 (0.94 to 9.10) | 1.48 (0.38 to 5.78) | 2.67* (1.16 to 6.15) | 1.87 (0.54 to 6.48) |
| Road surface | ||||
| Dry | 1 | 1 | 1 | |
| Wet | 0.58 (0.03 to 13.36) | 0.58 (0.24 to 1.38) | 0.05* (0.01 to 0.40) | |
| Day | ||||
| Monday | 1 | 1 | 1 | |
| Tuesday | 1.69 (0.85 to 3.34) | 1.14 (0.47 to 2.75) | 0.87 (0.36 to 2.12) | 0.62 (0.18 to 2.10) |
| Wednesday | 2.22 (1.06 to 4.64) | 1.52 (0.57 to 4.04) | 0.63 (0.19 to 2.04) | 0.88 (0.17 to 4.47) |
| Thursday | 1.88 (1.06 to 3.34) | 1.43 (0.68 to 3.01) | 1.47 (0.56 to 3.88) | 3.25 (0.62 to 17.04) |
| Friday | 1.45 (0.63 to 3.36) | 3.62 (1.35 to 9.74) | 1.24 (053 to 2.92) | 0.56 (0.15 to 2.10) |
| Saturday | 3.68 (1.86 to 7.26) | 3.99 (1.73 to 9.23) | 0.80 (0.33 to 1.93) | 0.20* (0.05 to 0.85) |
| Sunday | 1.51 (0.86 to 2.66) | 0.86 (0.41 to 1.83) | 0.24* (0.10 to 0.59) | 0.06* (0.01 to 0.26) |
| Road width | 1.09 (0.95 to 1.24) | 1.09 (0.93 to 1.27) | 1.29* (1.11 to 1.49) | 1.23* (0.97 to 1.56) |
| Time of crash | ||||
| 06:00–11:59 | 1 | 1 | 1 | |
| 12:00–17:59 | 0.58 (0.34 to 0.996) | 0.50 (0.26 to 0.95) | 1.66* (0.97 to 2.83) | 1.21 (0.52 to 2.84) |
| 18:00–23:59 | 0.36 (0.21 to 0. 64) | 0.54 (0.20 to 1.43) | 1.10 (0.62 to 1.95) | 0.20* (0.04 to 0.86) |
| 00:00–05:59 | 0.18 (0.11 to 0.32) | 1.29 (0.68 to 2.44) | 0.18* (0.03 to 0.95) | |
| Collision type | ||||
| Head on | 1 | 1 | 1 | |
| Rear end | 1.93 (1.02 to 3.69) | 1.67 (0.77 to 3.63) | 1.22 (0.66 to 2.23) | 2.02 (0.70 to 5.79) |
| Side swipe | 1.24 (0.67 to 2.30) | 2.45 (1.17 to 5.12) | 4.18* (1.55 to 11.22) | 28.12* (5.48 to 144.36) |
| Run-off road | 1.49 (0.87 to 2.56) | 2.39 (1.24 to 4.61) | 2.78* (1.54 to 5.04) | 2.72* (1.04 to 7.10) |
| Hit object | 1.11 (0.40 to 3.05) | 0.96 (0.28 to 3.30) | 2.08* (1.02 to 4.28) | 3.46 (0.71 to 16.76) |
| Hit pedestrian | 0.40 (0.19 to 0.82) | 0.22 (0.09 to 0.55) | 0.27* (0.12 to 0.58) | 0.18* (0.05 to 0.64) |
| Others | 0.81 (0.28 to 2.33) | 0.48 (0.15 to 1.52) | 2.44 (0.66 to 8.97) | 0.56 (0.07 to 4.32) |
| Light condition | ||||
| Day | 1 | 1 | 1 | |
| Night no light | 0.34 (0.23 to 0.51) | 0.39 (0.15 to 1.02) | 0.64 (0.37 to 1.11) | 9.06* (1.79 to 45.97) |
| Night light | 0.21 (0.09 to 0.49) | 0.15 (0.04 to 0.62) | 0.76 (0.48 to 1.18) | 5.71* (1.65 to 19.79) |
*, Statistically significant; aOR, adjusted OR; CI, Confidence Interval; cOR, crude OR.