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Table 3 Characteristics of the participants/study population, by COPD status

From: LASSO type penalized spline regression for binary data

Characteristic Summary Measure (total n = 6,564)
  COPD NO COPD
  n = 1367 (20.8%) n = 5197 (79.2%)
Age 65.2 (11.2) 57.0 (10.8)
Male 755 (55.2%) 2286 (44.0%)
BMI 27.3 (5.3) 27.9 (5.7)
Ever smoker (cigarette) 943 (69.0%) 2623 (50.5%)
Ever smoker (pipe or cigarette)     
Never smoker 406 (29.7%) 2543 (48.9%)
Ex smoker 645 (47.2%) 2030 (39.1%)
Current smoker 316 (23.1%) 624 (12.0%)
Pack Years 22.9 (24.6) 10.5 (17.0%)
Average cigarette per day 13.2 (12.6) 8.3 (11.4)
Duration of smoking (year) 23.0 (19.7) 11.8 (14.9)
Smoking cessation 943 (69.0%) 2623 (50.5%)
Occupation     
Hard rock mining 34 (2.5%) 80 (1.5%)
Coal mining 11 (0.8%) 12 (0.2%)
Working with asbestos 59 (4.3%) 157 (3.0%)
Chemical/plastics manufacturing 80 (5.9%) 231 (4.4%)
Foundry/steel milling 39 (2.9%) 106 (2.0%)
Welding 68 (5.0%) 172 (3.3%)
Saw-milling 39 (2.9%) 103 (2.0%)
  1. Mean (SD) is reported for quantitative variables, while count (%) is reported for categorical variables