| Risk factors | No reinfection group (N = 31) | Reinfection group (N = 9) | p value |
---|---|---|---|---|
Patient characteristics | Age (years) | Â | Â | Â |
 ≥ 65 | 23 (74%) | 6 (67%) | – | |
 < 65 | 8 (26%) | 3 (33%) | 0.6861 | |
Female | 17 (54%) | 5 (56%) | 0.9999 | |
Smoking history | 5 (16%) | 0 (0%) | 0.5696 | |
Alcohol history | 6 (19%) | 0 (0%) | 0.3065 | |
ASA grade | Â | Â | Â | |
 1–2 | 17 (55%) | 6 (67%) | – | |
 3–4 | 13 (42%) | 3 (33%) | 0.7110 | |
aCCI score | Â | Â | Â | |
 < 3 | 19 (61%) | 4 (44%) | – | |
 ≥ 3 | 12 (39%) | 5 (56%) | 0.4561 | |
Medical conditions | Diabetes | 5 (16%) | 2 (22%) | 0.6446 |
Hypertension | 10 (32%) | 1 (11%) | 0.3994 | |
Coronary heart disease | 4 (13%) | 1 (11%) | 0.9999 | |
Rheumatoid arthritis | 1 (3%) | 0 (0%) | 0.9999 | |
Microbiology | Culture negative | 12 (39%) | 4 (44%) | 0.9999 |
Gram-positive bacteria | 10 (32%) | 4 (44%) | 0.6935 | |
Gram-negative bacteria | 4 (13%) | 1 (11%) | 0.9999 | |
Fungi | 1 (3%) | 0 (0%) | 0.9999 | |
Co-infection | 4 (13%) | 0 (0%) | 0.5573 | |
Other risk factors | Duration of infection | Â | Â | Â |
 < 3 Months | 9 (29%) | 6 (67%) | – | |
 ≥ 3 Months | 22 (71%) | 3 (33%) | 0.0572 | |
History of prior Infection | 2 (6%) | 1 (11%) | 0.5450 | |
History of prior revision surgery | 1 (3%) | 4 (44%) | 0.0061 | |
Presence of sinus tract | 8 (26%) | 6 (67%) | 0.0444 |