Table 1.
Characteristics of the study population
| Characteristics | Total (n = 340) | No infection (n = 226) | Staphylococcal infection (n = 71) | Other infection (n = 43) | p value | |
| Global comparison | Staphylococcal versus othera | |||||
| Age, years (median, interquartile range) | 72 (64 to 79) | 73 (65 to 79) | 69 (62 to 77) | 72 (68 to 79) | 0.2 | 0.1 |
| Female sex, % | 54 (183 of 339) | 60 (134 of 225) | 44% (31 of 71) | 42% (18 of 43) | 0.02 | 1 |
| First implant revision, % | 62 (193 of 313) | 65 (139 of 213) | 56% (37 of 66) | 50% (17 of 34) | 0.1 | 0.7 |
| Site of prosthesis | < 0.001 | 0.01 | ||||
| Hip, % | 67 (227 of 339) | 74 (166 of 225) | 55% (39 of 71) | 51% (22 of 43) | ||
| Knee, % | 31 (104 of 339) | 25 (56 of 225) | 45% (32 of 71) | 37% (16 of 43) | ||
| Shoulder, % | 2 (8 of 339) | 1 (3 of 225) | 0% (0 of 71) | 12% (5 of 43) | ||
| Time since prosthesis insertion | 0.001 | 0.3 | ||||
| ≤ 3 months, % | 5 (15 of 335) | 2 (4 of 222) | 7% (5 of 71) | 14% (6 of 42) | ||
| > 3 months, % | 96 (320 of 335) | 98 (218 of 222) | 93% (66 of 71) | 86% (36 of 42) | ||
| Sinus tract, % | 10 (30 of 298) | 0 (0 of 210) | 32% (18 of 57) | 39% (12 of 31) | < 0.001 | 0.7 |
| CRP ≥ 10 mg/lb, % | 44 (148 of 334) | 25 (55 of 222) | 84% (59 of 70) | 81% (34 of 42) | < 0.001 | 0.9 |
| ESR ≥ 30 mm/hb, % | 37 (113 of 304) | 18 (38 of 210) | 78% (46 of 59) | 83% (29 of 35) | < 0.001 | 0.8 |
Data are presented as the number of total number %, unless otherwise specified.
a
Staphylococcal infection subgroup versus Other infection subgroup.
b
Cutoffs are from Tande and Patel [21]; CPR = C-reactive protein; ESR = erythrocyte sedimentation rate.