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

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