Table 3 Demographic data, surgery-related information and results of the blood and CSF examination preoperative in infection group and non-infection group

Male^b

120 (71.43%)

19 (76.00%)

Age^b

45.73 ± 15.17

42.28 ± 16.11

History of diabetes^b

22 (13.10%)

1 (4.00%)

History of chronic liver disease^b

27 (16.07%)

5 (20.00%)

History of chronic kidney disease^b

9 (5.36%)

2 (8.00%)

Preoperative stay < 3 days^b

42 (25.00%)

13 (52.00%)

Duration of surgery (min)^c

79.75 ± 32.01

76.16 ± 14.30

Standard prophylactic antimicrobial agents (cefuroxime or cefazolin)^b

95 (56.55%)

14 (56.00%)

Short duration of prophylactic antibiotics (up to 24 h)^b

102 (60.71%)

16 (64.00%)

Preoperative body temperature (°C)^c

37.04 ± 0.42

37.29 ± 0.52

Preoperative WBC of blood (× 10⁹/L)^c

9.06 ± 2.85

10.23 ± 3.03

Preoperative hemoglobin (g/L)^a

126.92 ± 17.09

126.84 ± 18.59

Preoperative CRP (mg/L)^c

24.55 ± 24.62

21.75 ± 23.89

Preoperative PCT (ng/mL)^c

0.20 ± 0.18

0.78 ± 1.04

Preoperative WBC of CSF (× 10⁶/L)^c

91.64 ± 70.73

86.83 ± 73.29

Preoperative protein of CSF (g/L)^c

0.97 ± 0.6

0.86 ± 0.49

Preoperative glucose of CSF (mmol/L)^c

1.97 ± 1.21

1.60 ± 0.97