The natural history of pedal puncture wounds in diabetics: a cross-sectional survey

BMC Surgery

Table 4 Multivariable logistic regression model for effect of not having felt puncture on risk of poor outcome.

Variables	Odds Ratio	95% CI for OR	P-value
Puncture not felt	6.64	1.2 to 36.7	0.03
Front sole punctured	5.97	1.16 to 30.69	0.033
Visited Dr. > 3 days after event	10.34	1.47 to 72.9	0.019

"Infected" was dropped from the model because this variable predicted failure perfectly (all episodes requiring surgical intervention were judged to be infected by patients).
"Compliance with diabetes treatment" was dropped because it predicted success perfectly (in 98.2% of episodes which healed without surgery, patients claimed that they were compliant at the time the puncture occurred, versus 85.7% for episodes requiring surgery.

ISSN: 1471-2482