Wound characteristics
| Infection (N=69) | No infection (N=2594) | Infection rate (2.6%) | p Value | |
|---|---|---|---|---|
| Hours from injury to presentation (SD) | 2.4 (1.9) | 3.0 (4.9) | 0.39 | |
| Difference −0.6, 95% CI −1.8 to 0.6 | ||||
| Length in cm (SD) | 3.5 (3.2) | 2.5 (2.2) | 0.005 | |
| Difference 1.0, 95% CI 0.5 to 1.5 | ||||
| Length >5 cm | 0.001 | |||
| Yes | 13 | 182 | 6.7% | |
| No | 56 | 2396 | 2.3% | |
| RR 2.9, 95% CI 1.6 to 5.2 | ||||
| Shape | 0.03 | |||
| Linear | 36 | 1657 | 2.1% | |
| Irregular/stellate | 31 | 834 | 3.6% | |
| Mechanism | 0.085 | |||
| Sharp, incised | 29 | 1180 | 2.4% | |
| Blunt, crush | 26 | 1121 | 2.3% | |
| Shattered glass | 3 | 98 | 3.0% | |
| Other/unknown | 11 | 195 | 5.3% | |
| Location | <0.001 | |||
| Scalp | 5 | 340 | 1.4% | |
| Face | 9 | 783 | 1.1% | |
| Ear | 0 | 15 | 0.0% | |
| Lips | 2 | 91 | 2.2% | |
| Arm | 6 | 134 | 4.3% | |
| Leg | 17 | 174 | 8.9% | |
| Hand | 17 | 581 | 2.8% | |
| Foot | 4 | 82 | 4.7% | |
| Other/unknown | 9 | 394 | 2.2% | |
| Location on lower extremity | <0.0001 | |||
| Yes | 21 | 256 | 7.6% | |
| No | 43 | 2279 | 1.9% | |
| RR 4.1, 95% CI 2.5 to 6.8 | ||||
| Contamination | 0.01 | |||
| Contaminated | 18 | 378 | 4.5% | |
| Clean | 51 | 2179 | 2.3% | |
| RR 2.0, 95% CI 1.2 to 3.4 | ||||
| Tissue trauma (requiring debridement) | 0.04 | |||
| Yes | 19 | 453 | 4.0% | |
| No | 44 | 1866 | 2.3% | |
| RR 1.7, 95% CI 1.03 to 3.0 | ||||