Table 5.
Results of logistic regression to assess the impact of the number and type of organism isolated from intraoperative culture on chance of recurrence of infection.
| Variables | No. of organisms isolated (p value) | Type of organism isolated (p value) | Preoperative isolation of correct organism (p value) |
|---|---|---|---|
| Constanta | −2.94 (<0.001)b | −2.94 (<0.001)b | −1.75 (<0.001)b |
| Single bacterial growth | 1.44 (0.172) | – | – |
| Polybacterial growth | 2.58 (0.023)b | – | – |
| Methicillin sensitive Staphylococcus aureus | – | 1.02 (0.359) | – |
| Coagulase negative Staphylococci | – | 0.23 (0.871) | – |
| Pseudomonas | – | 1.55 (0.304) | – |
| Enterobactericiae | – | 1.33 (0.373) | – |
| Methicillin resistant Staphylococcus aureus | – | 2.02 (0.063) | – |
| ESBL producing Enterobactericiae | – | 2.43 (0.048)b | – |
| Lack of knowledge of causative organism preoperatively | – | – | 0.50 (0.275) |
| R square | 0.06 | 0.08 | 0.01 |
ESBL: extended spectrum beta-lactamase.
a
Constant captured by culture negative category both in number and type of organism isolated. Regarding whether preoperative isolation of organism was useful, Constant is captured by the category of samples that grew organism in preoperative culture and agreed with those of intraoperative culture.
b
Statistically significant.