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Table 1 Patient characteristics and univariable analysis of risk factors for postoperative infection

From: Diagnostic value of routine chest tube tip culture in surgery for noninfectious lung disease

Characteristics Patients with postoperative infection
(n = 42)
Patients without postoperative infection
(n = 168)
P value
Demographics
Age (years) 62 [53–70] 63 [50–69] 0.67
Male sex 27 (64.3) 104 (61.9) 0.78
BMI (kg/m2) 25 [23–29] 25 [22–27] 0.10
Comorbidities
COPD 13 (31.0) 36 (21.4) 0.19
Diabetes mellitus 7 (16.7) 15 (8.9) 0.16
Lung transplantation in history 4 (9.5) 2 (1.2) 0.016
Cystic fibrosis 0 (0.0) 2 (1.2) 1.00
Smoking status    0.026
Never smoker 9 (21.4) 35 (20.8)  
Former smoker 31 (73.8) 95 (56.5)  
Current smoker 2 (4.8) 38 (22.6)  
Surgical method    0.092
VATS 20 (52.4) 104 (61.9)  
Thoracotomy 22 (47.6) 64 (38.1)  
Surgical procedure    0.460
Oncological
(Bi)lobectomy and lymph node dissection 23 (54.8) 89 (53.0)  
Sleeve resection and lymph node dissection 4 (9.5) 6 (3.6)  
Wedge resection 2 (4.0) 24 (14.3)  
Pleural or mediastinal mass biopsy/excision 0 (0) 7 (4.2)  
Other 1 (2.4) 5 (3.0)  
Non-oncological
(Bi)lobectomy 1 (2.4) 4 (2.4)  
Wedge resection 2 (4.8) 4 (2.4)  
Pleurodesis 6 (14.3) 23 (13.7)  
Decortication 2 (4.9) 3 (1.8)  
Other 1 (2.4) 3 (1.8)  
Chest tube drainage
Duration of postoperative chest drainage (days) 4 [4–8] 4 [3–6] 0.007
Positive chest tube tip culture 13 (31.0) 28 (16.7) 0.037
  1. Data are given as number n (%) or median [IQR]
  2. BMI, Body mass index; COPD, chronic obstructive pulmonary disease; IQR, interquartile range; NS, not significant; VATS, video-assisted thoracic surgery