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Table 1 The differences of risk factors in the infection and non-infection groups were analyzed by t test (measurement data)

From: Risk factors for acute surgical site infections after lumbar surgery: a retrospective study

Risk factors ASSI (mean ± SEM, n = 26) Non-ASSI (mean ± SEM, n = 897) t p
Age (year) 54.58 ± 2.710 54.93 ± 0.5503 0.1090 0.9132
BMI (kg/m2) 24.85 ± 0.9210 22.76 ± 0.1179 2.935 0.0034
Smoking (year) 21.27 ± 2.765 10.18 ± 0.3913 4.770 <0.0001
Number of internal fixation metals (piece) 5.423 ± 0.4374 5.252 ± 0.07764 0.3703 0.7112
Operative time (min) 208.5 ± 7.439 170.7 ± 2.776 2.307 0.0212
Blood loss (ml) 916.2 ± 72.66 696.5 ± 12.79 2.886 0.0040
Operative incision (cm) 13.38 ± 0.8340 11.93 ± 0.2319 1.061 0.2889
drainage tube (root) 1.538 ± 0.1385 1.394 ± 0.0306 0.7985 0.4248
Time of draining (day) 3.808 ± 0.3283 2.146 ± 0.05885 4.745 <0.0001
Capacity draining (ml) 440.0 ± 45.92 236.7 ± 8.072 4.230 <0.0001
  1. Italicized value is statistically different