TABLE 3.
Unadjusted and Adjusted ORs of All Surgical Site Infections for the 3 Periods Using the First Period (1993-1996) as a Reference
| Variable | Unadjusted OR (95% CI) | P value | Adjusted OR (95% CI) | P value |
|---|---|---|---|---|
| Study period | ||||
| 1993-1996 | 1 (Reference) | 1 (Reference) | ||
| 1997-2000 | 0.83 (0.50-1.37) | .46 | 0.83 (0.48-1.42) | .49 |
| 2001-2004 | 0.67 (0.38-1.17) | .17 | 0.50 (0.27-0.93) | .03 |
| 2005-2008 | 0.46 (0.24-0.91) | .03 | 0.39 (0.19-0.81) | .01 |
| Readmission | NA | NA | 3.81 (2.38-6.10) | <.001 |
| Length of hospital stay | NA | NA | 1.06 (1.04-1.08) | <.001 |
| BMI | NA | NA | 1.10 (1.06-1.15) | <.001 |
| Intraoperative cryoprecipitate transfusion | NA | NA | 4.58 (1.20-17.53) | .03 |
BMI = body mass index; CI = confidence interval; NA = not applicable; OR = odds ratio.