Table 2.
Comparison of baseline characteristics and initial infection control between retention and removal groups
| Variable | Retention (N = 32) | Removal (N = 32) | p Value (chi-square test |
|---|---|---|---|
| number (%) | number (%) | ||
| Age at PIIP (years) | 0.8 | ||
| ≤ 65 | 16 (50) | 17 (53) | |
| > 65 | 16 (50) | 15 (47) | |
| Gender | 0.45 | ||
| Female | 15 (47) | 18 (56) | |
| Male | 17 (53) | 14 (44) | |
| Host factor | 0.8 | ||
| Uncompromised | 13 (41) | 14 (44) | |
| Compromised | 19 (59) | 18 (56) | |
| Diabetes mellitus | 1 | ||
| Yes | 9 (28) | 9 (28) | |
| No | 23 (72) | 23 (72) | |
| Pre-PIIP number of operations | 0.21 | ||
| One | 18 (56) | 13 (41) | |
| Two or more | 14 (44) | 19 (59) | |
| Pre-PIIP treatment for infection | < 0.001* | ||
| Yes | 2 (6) | 19 (59) | |
| No | 30 (94) | 13 (41) | |
| Pre-PIIP implant | 0.77 | ||
| Primary | 25 (78) | 24 (75) | |
| Revision | 7 (22) | 8 (25) | |
| Type of infection | < 0.001* | ||
| Early postoperative | 6 (19) | 0 (0) | |
| Acute hematogenous | 23 (72) | 6 (19) | |
| Chronic | 3 (9) | 26 (81) | |
| Microorganism | 0.61 | ||
| Staphylococcus aureus | 14 (44) | 12 (38) | |
| Other | 18 (56) | 20 (62) | |
| Number of microorganisms | 1 | ||
| Polybacterial | 3 (9) | 3 (9) | |
| Monobacterial | 29 (91) | 29 (91) | |
| Infection control outcome | 0.02* | ||
| Controlled | 10 (31) | 19 (59) | |
| Not controlled | 22 (69) | 13 (41) | |
Percentages are shown in parentheses. PIIP = postoperative infection index procedure.
* Statistically significant difference.