Table 2.

Difference in mean ulcer size according to whether a given bacterial species was resident or not

Bacteria	Resident *(no of ulcers)	Ulcer size Mean [95% CI] (cm2)†	P value‡
Staphylococcus aureus	Yes (25)	11·71 [7·74; 17·72]	<0·005
	No (11)	37·33 [20·02; 69·61]
Pseudomonas aeruginosa	Yes (13)	35·89 [20·49; 62·88]	<0·005
	No (23)	10·83 [7·09; 16·52]
Enterococcus faecalis	Yes (9)	15·02 [6·85; 32·93]	>0·05
	No (27)	17·28 [10·98; 27·18]
Proteus vulgaris	Yes (6)	20·56 [7·89; 53·59]	>0·05
	No (30)	16·00 [10·42; 24·57]
Proteus mirabilis	Yes (6)	11·91 [4·59; 30·86]	>0·05
	No (30)	17·85 [11·66; 27·35]
Escherichia coli	Yes (6)	15·49 [5·93; 40·51]	>0·05
	No (30)	16·93 [11·01; 26·04]
Anaerobic bacteria§	Yes (14)	26·88 [16·38; 44·14]	>0·05
	No (30)	16·86 [12·23; 23·24]

^* A bacterial species was resident for a specific patient if the bacterial species was observed at all or at all but one of the observation times for the patient in question.

^† Analyses were based on log‐transformed observations for 36 patients. The reported results are transformed back to the scale of measurement.

^‡ The P value for testing for difference in mean ulcer size between patients grouped according to whether the given bacteria species was resident or not.

^§ Analyses based on inclusion time (week 0), two patients were excluded due to extreme ulcer size. These two patients were excluded from all the statistical analyses.