Table 1. Healing data of ulcers 12 weeks postoperative from ulcers with or without P. aeruginosa.

Week 12 follow-up results:	P. aeruginosa pre- or perioperative
	No	Yes
Healed	73,10%	33,30%
[98%-100%]	(49/67)	(8/24)
Not healed	26,90%	66,70%
[0%-98%]	(18/67)	(16/24)

Table 2 is transferred into table 1 by merging categories.

P = 0,001, N = 91, Chi = 11,96, Chi-square test.