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Table 1 Baseline characteristics

From: Risk factors for surgical site infection after craniotomy: a prospective cohort study

Baseline characteristics

 

OVERALL (n = 595)

Male, n (%)

274

(46.1)

Mean age, years (SD)

52.8

(14.4)

  > 65y, n (%)

148

(24.9)

Urgent surgery, n (%)

79

(13.3)

Reason of surgery:

Intrinsic tumour, n (%)

234

(39.3)

Extrinsic tumour, n (%)

123

(20.7)

Epilepsy, n (%)

23

(3.9)

Vascular, n (%)

152

(25.5)

Trauma, n (%)

17

(2.9)

Others, n (%)

46

(7.7)

Surgical site:

Supratentorial, n (%)

449

(75.5)

Infratentorial, n (%)

62

(10.4)

Retromastoid, n (%)

84

(14.1)

Duration of surgery, minutes (SD)

256.9

(101.5)

  > P75a, n (%)

152

(25.5)

Mean hospital stay, median (range)

7

(5–14)

CHARLSON score, (range)

3

(0–13)

  < 3, n (%)

292

(49.1)

3–5, n (%)

214

(36)

6–8, n (%)

69

(11.6)

  > 9, n (%)

20

(3.4)

ASAb, (range)

2

(1–5)

ASA > 2, n (%)

223

(37.5)

NNISc, (range)

1

(0–2)

NNIS I-II, n (%)

441

(74.1)

  1. a > 75 percentile of duration of surgery
  2. bAmerican Society of Anaesthesiologists
  3. cNational Nosocomial Infection Surveillance System