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Table 1 Comparison of preoperative characteristics of patients with and without surgical site infections

From: Surgical site infection after delayed sternal closure in neonates with congenital heart disease: retrospective case-control study

   All (n = 188) Surgical site infection χ2 P value
No (n = 141) Yes (n = 47)
Sex Male 92 71 21 0.454 0.5
Female 96 70 26
Weight W ≤ 1500 g 8 1 (12.5%) 7 (87.5%) 43.262 0.000
1500 g < w ≤ 2000 g 50 30 (60%) 20 (40%)
2000 g < w ≤ 2500 g 50 41 (82%) 9 (18%)
2500 g < w ≤ 3000 g 20 11 (55%) 9 (45%)
W > 3000 g 60 58 (96.7%) 2 (3.3%)
Age at operation ≤1 d 13 2 (15.4%) 11 (84.6%) 111.572 0.000
1<age ≤ 3 d 25 4 (16%) 21 (84%)
3<age ≤ 7 d 26 14 (53.8%) 12 (46.2%)
7<age ≤ 14 d 49 46 (93.9%) 3 (6.1%)
>14 d 75 75 (100%) 0
Genetic anomaly no 171 129 (75.4%) 42 (24.6%) 0.022 0.883
yes 17 12 (70.6%) 5 (29.4%)
Prematurity (≤37w) no 133 124 (93.2%) 9 (6.8%) 80.606 0.000
yes 55 17 (30.9%) 38 (69.1%)
  1. P<0.05, Chi squared test