Table 4.
Negative Binomial Regression Analysis Describing the Relationships between Postoperative Infection, Patient Characteristics, Comorbidities, and Total Reoperations
| IRR* | 95% CI | SE | P † | |
|---|---|---|---|---|
| Infection | 3.11 | (2.92–3.31) | 0.032 | <0.001 |
| Diabetes | 1.04 | (0.96–1.13) | 0.042 | 0.34 |
| Age | 0.99 | (0.99–1.00) | 0.001 | <0.001 |
| Hypertension | 0.95 | (0.90–1.01) | 0.030 | 0.084 |
| Smoking status | 1.27 | (1.18–1.38) | 0.040 | <0.001 |
| Obesity | 0.93 | (0.86–1.00) | 0.040 | 0.055 |
| Neoadjuvant chemotherapy | 1.05 | (0.99–1.11) | 0.028 | 0.0709 |
| Radiation | 1.41 | (1.33–1.50) | 0.031 | <0.001 |
*
IRR denotes incidence rate ratio, which compares the incidence rate of total revision procedures between patients with and without characteristics of interest.
†
Significance is defined as P < 0.00625, adjusted per the Bonferroni correction for multivariate regression.