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Table 1 Description of the studied population

From: Association of ADAM33 gene polymorphisms with COPD in a northeastern Chinese population

Characteristic CASE CONTROL
Number of patients 312 319
Age (years) 60.5 (7.8) 61.5 (8.1)
Male: Female 186:126 192:127
Pack years of smoking 35.46 (15.9) 32.54 (12.7)
FEV1 (% predicted) 52.5 (8.6) 91.5 (9.6)
FEV1/FVC (%) 47.5 (7.6) 90.5 (11.6)
Postbd FEV1 (% predicted) 58.5 (9.6) 93.5 (10.5)
Postbd FEV1/FVC (%) 49.2 (8.5) 91.5 (11.8)
  1. Data are means and standard deviations (in parentheses)
  2. Pack year: (packs per day) × (years smoked)
  3. FEV1: forced expiratory volume in first second
  4. FVC: forced vital capacity
  5. Postbd: post bronchodilator