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Table 1 Basic characteristics. Comparing subjects with normal lung function (NLF) vs. restrictive pattern and normal lung function vs. COPD. Analyses were performed among subjects “stable non-COPD” (NLF and restrictive pattern) and “stable COPD); at baseline and in 2005 (significant values in bold)

From: Ischemic heart disease among subjects with and without chronic obstructive pulmonary disease – ECG-findings in a population-based cohort study

Categories Variables NLF n = 612 Restrictive pattern n = 145 Pc COPD n = 576 Pd
Sex
  Women, n (%) 292 (47.7) 60 (41.4) 0.17 243 (42.2) 0.06
Age
  Mean (SD) 64.8 (11.0) 68.6 (10.1) <0.001 66.6 (10.6) 0.004
BMI
  Mean (SD) 27.1 (4.0) 28.4 (4.4) 0.001 26.3 (4.1) 0.001
  Underweight <20, n (%) 6 (1.0) 4 (2.8)   22 (3.8)  
  Normal 20–24.9, n (%) 194 (31.7) 27 (18.8)   204 (35.4)  
  Overweight 25–29.9, n (%) 290 (47.4) 68 (47.2)   259 (45.0)  
  Obese ≥30, n (%) 122 (19.9) 45 (31.3)   91 (15.8)  
Smoking habits
  Pack years, mean (SD) 6.5 (10.3) 6.8 (11.3) 0.74 17.0 (16.2) <0.001
  Current smoker, n (%) 71 (11.6) 13 (9.0)   207 (35.9)  
  Ex smoker, n (%) 234 (38.2) 52 (35.9)   241 (41.8)  
  Non smoker, n (%) 307 (50.2) 80 (55.2)   128 (22.2)  
Comorbiditiesa
  Diabetes, n (%) 47 (7.7) 26 (17.9) <0.001 49 (8.5) 0.60
  Hypertension, n (%) 197 (32.2) 69 (47.6) 0.001 198 (34.4) 0.42
  Angina pectoris, n (%) 67 (10.9) 27 (18.6) 0.01 70 (12.2) 0.521
  Myocardial infarction, n (%) 14 (2.3) 12 (8.3) 0.001 32 (5.6) 0.004
  CABG, n (%) 18 (2.9) 7 (4.8) 0.25 10 (1.7) 0.17
  PCI, n (%) 8 (1.3) 5 (3.4) 0.07 8 (1.4) 0.90
  Arrhythmias, n (%) 44 (7.2) 20 (13.8) 0.01 46 (8.0) 0.60
  Reported IHDb, n (%) 77 (12.6) 32 (22.1) 0.005 93 (16.1) 0.08
  1. aBased on interview data. bSelf-reported IHD, includes any of angina pectoris, myocardial infarction, CABG and PCI
  2. Pc comparison between normal lung function and restrictive pattern Pd comparison between normal lung function and COPD