Baseline clinical characteristics and variables related to acute coronary syndrome severity of the ISAACC patients according to apnoea–hypopnoea index (AHI)
| AHI | p-value# | ||
| <15 events·h−1 | ≥15 events·h−1 | ||
| Patients n | 298 | 680 | |
| Clinical background | |||
| Hypertension | 125 (42) | 362 (53) | 0.001 |
| Dyslipidaemia | 144 (48) | 356 (52) | 0.246 |
| Diabetes mellitus | 64 (22) | 168 (25) | 0.274 |
| Cardiomyopathy | 69 (23) | 145 (22) | 0.569 |
| Stroke | 7 (2) | 25 (4) | 0.274 |
| Cardiovascular variables | |||
| First ACS episode | 238 (85) | 520 (82) | 0.199 |
| Anomalies in ECG | 233 (90) | 518 (91) | 0.621 |
| ACS category | |||
| Unstable angina | 33 (13) | 67 (12) | |
| Non-STEMI | 125 (50) | 268 (48) | |
| STEMI | 94 (37) | 224 (40) | 0.736 |
| Ejection fraction | 56.9±10 | 54.9±11 | 0.017 |
| Killip Class | 0.060 | ||
| I | 221 (95) | 497 (90) | |
| II | 11 (5) | 47 (8) | |
| III | 0 (0) | 6 (1) | |
| IV | 0 (0) | 3 (1) | |
Data are presented as n (%) or mean±sd, unless otherwise stated. ACS: acute coronary syndrome; ECG: electrocardiogram; STEMI: ST-elevation myocardial infarction. #: Chi-squared test, one-way ANOVA or Mann-Whitney test as appropriate.