Table 3.

Conditional logistic regression analysis of surgical delay and intraoperative variables

Variables	RR and 95%CI	P
Interval between injury and operation (days)	1.86 (1.19–2.91)
4–10	Reference
< 4	5.2 (1.8–14.9)	0.002
> 10	2.4 (1.1–5.1)	0.028
Wound classification (IIvs I)	4.4 (1.7–11.7)	0.003
Current smoking	2.6 (1.2–5.6)	0.014
Injury mechanism (high vs low and medium energy)	2.1 (1.1–4.8)	0.036
HCT (< lower limit)	1.9 (1.0–3.9)	0.047