Table 2: statistical analysis of wound class: clean, clean contaminated, contaminated and dirty.

Item		Total no.	Infected no.	Rate	P value (sig<0.05)	95% CI
						lower	upper
Wound class	Clean	45	4	8.9	0.003	NA
	Clean-contaminated	33	13	39.4
	Contaminated	17	8	47.1
	Dirty	5	1	20