| Variables | All (n = 3143) No (%) (95% CI) | Men (n = 1503) No (%) (95% CI) | Women (n = 1640) No (%) (95% CI) | p Value |
| Ischaemia on ECG* | ||||
| Q-wave changes† | 68 (2.2) (1.5 to 2.7) | 46 (3.1) (1.9 to 4.1) | 22 (1.3) (0.7 to 1.9) | 0.001 |
| Past history of heart attack diagnosed by doctor | 113 (3.6) (2.5 to 4.6) | 64 (4.3) (2.8 to 5.6) | 49 (3.0) (1.9 to 4.0) | 0.068 |
| Past history of heart attack or Q-wave changes diagnosed by doctor | 158 (5.0) (3.8 to 6.1) | 97 (6.1) (4.1 to 8.0) | 66 (4.0) (3.0 to 5.0) | 0.009 |
| Positive Rose angina questionnaire | 398 (12.7) (10.8 to 14.5) | 134 (8.9) (7.3 to 10.5) | 264 (16.0) (13.4 to 18.7) | <0.001 |
| Major ECG abnormalities‡ | 502 (16.0) (13.1 to 18.7) | 158 (10.5) (8.1 to 12.8) | 344 (21.0) (16.9 to 25.0) | <0.001 |
*Ischaemia on ECG: Minnesota codes 1-3 or 4-1 or 4-2 or 4-3 or 5-1 or 5-2 or 5-3 or 7-1.
†Q-wave changes: Minnesota codes 1-1 to 1-2.
‡Major ECG abnormalities: Minnesota codes: 4-1 or 4-2 or 5-1 or 5-2 or 6-1 or 6-2 or 7-1 or 7-2 or 8-1 or 8-3.