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Table 1 Patient demographics

From: The impact of emphysema on surgical outcomes of early-stage lung cancer: a retrospective study

Variablea Non-emphysema (n = 301) Emphysema (n = 63) P
Sex
 Male 169 (56.1) 54 (85.7) < 0.001
 Female 132 (43.9) 9 (14.3)  
Age (y) 69.0 ± 8.2 71.2 ± 8.0 0.049
BMI (kg/m2) 22.3 ± 2.9 21.2 ± 2.9 0.006
Smoking index 565.4 ± 650.4 1305.4 ± 719.1 < 0.001
VC (%) 105.0 ± 62.0 101.7 ± 18.1 0.633
FEV1/FVC (%) 76.2 ± 8.6 67.6 ± 12.9 < 0.001
COPD    < 0.001
 No 243 (80.7) 27 (42.9)  
 Yes 58 (19.3) 36 (57.1)  
Surgical procedure    0.798
 Sublobar resection 119 (39.5) 26 (41.3)  
 Lobectomy 182 (60.5) 37 (58.7)  
Tumor size (mm) 22.6 ± 9.8 25.9 ± 11.5 0.038
Histology    < 0.001
 Adenocarcinoma 250 (83.0) 33 (52.4)  
 Squamous cell carcinoma 37 (12.3) 26 (41.3)  
 Other 14 (4.6) 4 (6.3)  
Histologic grade    0.001
 Well differentiated 159 (52.8) 18 (28.6)  
 Moderately differentiated 107 (35.6) 31 (49.2)  
 Poorly differentiated 35 (11.6) 14 (22.2)  
Pleural invasion    < 0.001
 Absent 226 (75.1) 33 (52.4)  
 Present 75 (24.9) 30 (47.6)  
  1. BMI Body mass index, VC vital capacity, FEV1 forced expiratory volume in 1 s; FVC forced vital capacity
  2. aCategorical data are expressed as numbers, and continuous data are expressed as means ± standard deviation