Table 4

Results of the final step of the backward logistic regression analysis. Three factors remained in the final model and are presented with their odds ratio and 95%-confidence interval. The coefficient of each factor can be used with the constante of the model to calculate a predicted risk for each patient

Coefficient

Standard error

P

Odds ratio (95%-confidence interval)

Catheter placement in the groin

1.222

0.424

0.004

3.39 (1.48 – 7.79)

Changing the dressing (per attempt)

0.753

0.222

0.001

2.12 (1.37 – 3.29)

Postoperative administration of an antibiotic (at least for 24 hours)

- 0.896

0.516

0.05

0.41 (0.12 – 1.02)

Intercept

- 2.634

0.414

< 0.0001

Morin et al. BMC Anesthesiology 2005 5:1   doi:10.1186/1471-2253-5-1