Baseline characteristics of 1239 patients presenting with acute myocardial infarction and ST elevation, stratified for Q wave development
| Q wave infarction (n=979) | Non-Q wave infarction (n=248) | p Value | |
| Age (years) | 62.0 (53 to 71) | 61.0 (52.5 to 69.5) | NS |
| Male sex | 708 (72.3) | 182 (73.4) | NS |
| Racial group | |||
| African | 28 (2.9) | 12 (4.8) | |
| Asian | 258 (26.4) | 59 (23.8) | |
| White | 693 (70.8) | 177 (71.4) | NS |
| Smoking | 502 (52.6) | 148 (60.2) | 0.03 |
| Hypertension | 303 (31.3) | 79 (32.0) | NS |
| Diabetes | 190 (19.5) | 56 (22.6) | NS |
| Previous treatment with: | |||
| Aspirin | 84 (9.1) | 36 (15.5) | 0.005 |
| β Blocker | 90 (9.8) | 27 (11.7) | NS |
| Emergency treatment with: | |||
| Aspirin | 865 (89.6) | 230 (93.5) | 0.07 |
| Thrombolysis | 771 (79.1) | 204 (82.3) | NS |
| Pain duration < 120 min | 473 (51.7) | 125 (52.1) | NS |
| Admission biochemistry (mmol/l) | |||
| Glucose | 9.0 (5.9 to 12.1) | 8.5 (5.8 to 11.2) | NS |
| Potassium | 4.0 (3.7 to 4.3) | 4.0 (3.7 to 4.3) | NS |
| Mortality | |||
| 30 Days | 149 (15.2) | 11 (4.4) | < 0.001 |
| 6 Months | 176 (18.0) | 14 (5.6) | < 0.001 |
Q wave data unavailable in 12 patients. Data are numbers (percentages), except for age, glucose, and potassium, which are median values (interquartile range).