Table 1 Study sample characteristics

Patient’s characteristics

Female, n (%)

1101 (67.5)

Hip surgery, n (%)

861 (52.8)

Elective surgery, n (%)

1508 (92.5)

Surgical site infection at 90 days, n (%)

62 (3.8)

Type of surgical site infection, n (%)

Superficial

22 (35.5)

Deep

27 (43.5)

Organ / space

13 (21.0)

Age (years), median (P25, P75)

69 (62, 77) (n = 1631)

Charlson index, median (P25, P75)

2 (1, 3) (n = 622)

ASA score, median (P25, P75)

2 (2, 2) (n = 483)

Algorithm variables (90 days after surgery)

Positive microbiological result, n (%)

134 (8.2)

≥ 3 microbiological requests, n (%)

136 (8.3)

Antimicrobial therapy ≥ 7 days, n (%)

152 (9.3)

Length of hospital stay ≥ 14 days, n (%)

267 (16.4)

Orthopaedics readmission, n (%)

230 (14.1)

Orthopaedics reintervention, n (%)

146 (9.0)

Emergency department, n (%)

288 (17.7)