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Table 2 General characteristics of the study participants

From: Expression of aquaporins in bronchial tissue and lung parenchyma of patients with chronic obstructive pulmonary disease

  Controls (n = 15) COPD patients (n = 15) p
Male sex (n) 14 (93.3) 10 (66.7) NS
Age (years) 62.5 (9.8) 68.3 (7.4) NS
Active smokers (n) 3 (20) 3 (20) NS
Body mass index (Kg/m2) 26.1 (4.4) 28.5 (4.2) NS
FVC (mL) 3,274.1 (1,108.5) 3,016 (310.2) NS
FVC (%) 92.8 (15.9) 86.7 (20.9) NS
FEV1 (mL) 2,459.1 (775.5) 1,717 (574.6) 0.021
FEV1 (%) 92.8 (33.1) 72 (13) 0.031
FEV1/FVC (%) 76.2 (6.6) 62.5 (4.8) < 0.001
Resection type    NS
- Pneumonectomy or (n) 4 (26.7) 2 (13.3)  
- Lobectomy (n) 11 (73.3) 12 (80.0)  
- Atypical (n) 0 1 (6.7)  
Pathology:    NS
- Squamous carcinoma (n) 6 (40.0) 8 (53.3)  
- Adenocarcinoma (n) 5 (33.3) 7 (46.7)  
- Other (n) 2 (13.3) 0  
- Benign tumor (n) 1 (6.7) 0  
- Non-neoplastic disease (n) 1 (6.7) 0  
  1. Data are expressed as means (standard deviations) or absolute (relative) frequencies, as appropriate. FEV1, forced expired volume in 1 second; FVC, Forced vital capacity; NS, not significant.