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Table 3 Details of surgical data

From: Incidence and predictors of surgical site infection after distal femur fractures treated by open reduction and internal fixation: a prospective single‐center study

Variables All patients
(n = 364)
Patients without SSI (n = 342) Patients with SSI(n = 22) p value
Preoperative stay (days), median 6 6 5 0.184b
Preoperative stay (≥ 7 days), n(%) 176(48.4) 165(48.2) 11(50.0) 0.873c
Incision cleanliness     < 0.001c*
 I, n(%) 333(91.5) 322(94.2) 11(50.0)  
 II, n(%) 18(5.0) 14(4.1) 4(18.2)  
 III, n(%) 13(3.5) 6(1.8) 7(31.8)  
ASA     0.133c
 I-II, n(%) 236(64.8) 225(65.8) 11(50.0)  
 III-V, n(%) 128(35.2) 117(34.2) 11(50.0)  
Anesthesia type     0.497c
 Local anesthesia, n(%) 16(4.4) 14(4.1) 2(9.1)  
 Combined spinal-epidural, n(%) 155(42.6) 147(43.0) 8(36.4)  
 General, n(%) 193(53.0) 181(52.9) 12(54.5)  
 Drainage use, n(%) 190(52.2) 174(50.9) 16(72.7) 0.047c*
 Plate use(vs. without plate), n(%) 282(77.5) 263(76.9) 19(86.4) 0.303c
 Intraoperative blood loss (ml), median 400 400 550 0.151b
 Intraoperative blood loss
≥ 400 mL, n(%)
174(47.8) 161(47.1) 13(59.1) 0.274c
 Surgical duration (minutes), median 165 163 180 0.136b
Surgical duration     0.312c
 < 120 min, n(%) 58(15.9) 56(16.4) 2(9.1)  
 120–180 min, n(%) 191(52.5) 181(52.9) 10(45.5)  
 > 180, n(%) 115(31.6) 105(30.7) 10(45.5)  
 Postoperative stay (days), median 12 11 36 < 0.001b*
  1. Abbreviation: SSI surgical site infection, ASA American Society of Anesthesiologists
  2. b Mann-Whitney U test.
  3. c Pearson Chi-Square test.
  4. * indicates significant variable at p < 0.05.