Table 2B: Electrocardiograms abnormalities according to sex and age group: enlargement and hypertrophy, ischemia and other abnormalities (n = 264,324).
| Age group | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Abnormalities | 20-39.9 years | 40-59.9 years | 60-79.9 years | > 80 years | ||||||||
| F (n = 35,463) | M (n = 20,922) | P | F (n = 61,911) | M (n = 37,555) | P | F (n = 42,501) | M (n = 31,973) | P | F (n = 7,596) | M (n = 5,685) | P | |
| Enlargement and hypertrophy | ||||||||||||
| Right atrial enlargement | 38 (0.10%) | 28 (0.13%) | 0.371 | 81 (0.13%) | 82 (0.21%) | 0.001 | 103 (0.2%) | 86 (0.3%) | 0.509 | 16 (0.2%) | 16 (0.3%) | 0.477 |
| Right ventricular enlargement | 11 (0.03%) | 30 (0.14%) | < 0.001 | 16 (0.02%) | 36 (0.09%) | < 0.001 | 32 (0.1%) | 45 (0.1%) | 0.007 | 11 (0.1%) | 10 (0.2%) | 0.665 |
| Left atrial hypertrophy | 218 (0.61%) | 238 (1.13%) | < 0.001 | 1,157 (1.86%) | 1,245 (3.31%) | < 0.001 | 1,470 (3.5%) | 1,785 (5.6%) | < 0.001 | 357 (4.7%) | 308 (5.4%) | 0.064 |
| Left ventricular hypertrophy | 152 (0.42%) | 412 (1.96%) | < 0.001 | 1,055 (1.70%) | 1,526 (4.06%) | < 0.001 | 2,036 (4.8%) | 2,250 (7.0%) | < 0.001 | 658 (8.7%) | 521 (9.2%) | 0.324 |
| Ischemia | ||||||||||||
| Subendocardial | 16 (0.04%) | 13 (0.06%) | 0.278 | 135 (0.21%) | 6 (0.25%) | 0.233 | 233 (0.5%) | 141 (0.4%) | 0.042 | 79 (1.0%) | 40 (0.7%) | 0.051 |
| Subepicardial | 37 (0.10%) | 51 (0.24%) | < 0.001 | 273 (0.44%) | 276 (0.73%) | < 0.001 | 390 (0.9%) | 333 (1.0%) | 0.089 | 80 (1.1%) | 51 (0.9%) | 0.376 |
| Q wave | 10 (0.02%) | 14 (0.06%) | 0.031 | 136 (0.21%) | 194 (0.51%) | < 0.001 | 189 (0.4%) | 298 (0.9%) | < 0.001 | 51 (0.7%) | 56 (1.0%) | 0.049 |
| Poor R wave progression | 195 (0.549%) | 286 (1.366%) | < 0.001 | 829 (1.33%) | 922 (2.45%) | < 0.001 | 1,279 (3.0%) | 1,642 (5.1%) | < 0.001 | 354 (4.7%) | 381 (6.7%) | < 0.001 |
| Other abnormalities | ||||||||||||
| ST segment elevation | 79 (0.22%) | 490 (2.34%) | < 0.001 | 136 (0.21%) | 537 (1.42%) | < 0.001 | 120 (0.3%) | 262 (0.8%) | < 0.001 | 36 (0.5%) | 42 (0.7%) | 0.051 |
| ST segment depression | 44 (0.12%) | 27 (0.12%) | 0.872 | 304 (0.49%) | 165 (0.43%) | 0.249 | 382 (0.9%) | 278 (0.9%) | 0.692 | 114 (1.5%) | 53 (0.9%) | 0.004 |
| Peaked T waves | 3 (0.008%) | 9 (0.043%) | 0.007 | 9 (0.01%) | 24 (0.06%) | < 0.001 | 5 (0.0%) | 26 (0.1%) | < 0.001 | 7 (0.1%) | 7 (0.1%) | 0.600 |
| Long QT | 7 (0.019%) | 3 (0.01%) | 0.642 | 21 (0.03%) | 12 (0.03%) | 0.869 | 26 (0.1%) | 15 (0.0%) | 0.433 | 5 (0.1%) | 6 (0.1%) | 0.546 |
| WPWS | 86 (0.24%) | 66 (0.31%) | 0.107 | 95 (0.15%) | 79 (0.21) | 0.037 | 48 (0.1%) | 51 (0.2%) | 0.103 | 9 (0.1%) | 4 (0.1%) | 0.418 |
| Brugada pattern | 5 (0.014%) | 8 (0.038%) | 0.068 | 4 (0.006%) | 13 (0.034%) | 0.001 | 4 (0.0%) | 7 (0.0%) | 0.224 | 0 | 0 | |
| Low QRS | 39 (0.109%) | 13 (0.062%) | 0.071 | 152 (0.24%) | 83 (0.22%) | 0.440 | 132 (0.3%) | 139 (0.4%) | 0.006 | 40 (0.5%) | 29 (0.5%) | 0.998 |
| Early repolarization | 112 (0.31%) | 851 (4.06%) | < 0.001 | 106 (0.17%) | 710 (1.89%) | < 0.001 | 78 (0.2%) | 287 (0.9%) | < 0.001 | 6 (0.1%) | 27 (0.5%) | < 0.001 |
| Nonspecific ventricular repolarization abnormalities | 3,278 (9.24%) | 2,152 (10.28%) | < 0.001 | 12,578 (20.3%) | 6,919 (18.42%) | < 0.001 | 12,994 (30.6%) | 8,784 (27.5%) | < 0.001 | 2,890 (38.0%) | 2,035 (35.8%) | 0.008 |
| Normal | 28,599 (80.64%) | 14,787 (70.67%) | < 0.001 | 40,945 (66.13%) | 22,481 (59.86%) | < 0.001 | 19,843 (46.7%) | 13,031 (40.8%) | < 0.001 | 2,232 (29.4%) | 1,378 (24.2%) | < 0.001 |
F = female examinations; M = male examinations; P = P-value; WPWS = Wolff-Parkinson-White syndrome.