Table 4.
Baseline ECG characteristics. Data shown are % of randomised subjects within each column.
| Description | Minneosta Codes | Men | Women | ||
| Primary | Secondary | Primary | Secondary | ||
| Subjects(%) | 1345 (23.2) | 1459 (25.1) | 1894 (32.6) | 1106 (19.1) | |
| Myocardial infarction – Definite | 1–1 | 4.2 | 14.2 | 2.8 | 6.3 |
| Myocardial infarction – Probable | 1–2 (except 1-2-8) | 4.0 | 9.6 | 3.6 | 4.8 |
| Myocardial infarction – Possible | 1–3 | 7.4 | 9.8 | 7.7 | 7.5 |
| Left ventricular hypertrophy – Definite | 3-1 and at least one of (4-1, 4-2, 5-1, 5-2) | 3.2 | 3.4 | 3.1 | 6.1 |
| Left ventricular hypertrophy – Possible | 3-1 and (4-3 and/or 5-3) or 3-3 and at least one of (4-1,4-2,4-3,5-1,5-2, 5-3) | 2.6 | 3.1 | 5.1 | 4.7 |
| Myocardial ischaemia – Probable | (4-1 and/or 4-2) and at least one of (5-1,5-2 or 5-3) | 1.8 | 2.9 | 3.1 | 4.3 |
| Myocardial ischaemia – Possible | 5-1 or 5-2 | 1.9 | 2.4 | 2.1 | 4.5 |
| Non-specific T-wave changes | 5-3 | 7.9 | 7.3 | 10.2 | 13.1 |
| RVH Possible | 3-2 | 0.1 | 0 | 0.2 | 0.1 |
| Left axis deviation | 2-1 | 10.6 | 9.0 | 8.0 | 8.1 |
| Right axis deviation | 2-2 or 2-3 | 0.5 | 0.6 | 0.3 | 0.3 |
| Left bundle branch block | 7-1-1 | 1.4 | 2.6 | 2.2 | 3.0 |
| Right bundle branch block | 7-2-1 or 7-8 | 7.0 | 6.5 | 2.4 | 2.3 |
| Intraventricular conduction disturbances | 7-4 | 2.8 | 7.6 | 1.6 | 3.3 |
Notes : the characteristics are coded according to the following hierarchies: (i) In the myocardial infarction categories, a subject is included only once in the category corresponding to the most significant code, with definite having precedence over probable and probable precedence over possible. (ii) In the left ventricular hypertrophy categories, a subject is included only once in the category corresponding to the most significant code, with definite having precedence over possible. (iii)Subjects with a code corresponding to a definite, probable or possible myocardial infarction or a definite or possible left ventricular hypertrophy are excluded from the categories corresponding to probable or possible myocardial ischaemia or non-specific T-wave change. (iv) In the categories for myocardial ischaemia and non-specific T-wave changes, a subject is included only once in the category corresponding to the most significant code, with probable myocardial ischaemia having precedence over possible myocardial ischaemia which in turn has precedence over non-specific T-wave change.