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Table 2 Ischemic ECG changes comparing subjects with normal lung function and COPD

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

    NLF n = 612 COPD n = 576 P
Ischemic ECG changes
  Q-Waves Any, n (%) 49 (8.7) 48 (8.3) 0.64
   Major Q/QS, n (%) 20 (3.4) 24 (4.2) 0.42
   Minor Q/QS, n (%) 29 (4.9) 24 (4.2) 0.66
  ST-segment depressions Any, n (%) 39 (6.4) 33 (5.7) 0.23
   Major, n (%) 4 (0.7) 4 (0.7) 0.94
   Intermediate, n (%) 20 (3.3) 18 (3.1) 0.88
   Minor, n (%) 15 (2.5) 11 (1.9) 0.52
  T- wave items Any, n (%) 98 (16.0) 100 (17.4) 0.53
   Major, n (%) 2 (0.4) 1 (0.2) 1.00
   Intermediate, n (%) 44 (7.9) 45 (8.7) 0.64
   Minor, n (%) 52 (9.2) 54 (9.4) 0.56
  Bundle branch block LBBBa, n (%) 10 (1.9) 11 (2.3) 0.68
Whitehall criteria
  Ischemic heart disease Any, n (%) 140 (22.9) 142 (24.7) 0.47
   Probableb, n (%) 27 (5.4) 35 (6.1) 0.19
   Possiblec, n (%) 113 (19.3) 107 (18.6) 0.85
  1. aLeft bundle branch block. bIncluding Major Q/QS and LBBB. cIncluding Minor Q/QS, any ST-segment depression and any T-wave item