Table 2. Derivation and validation cohorts.
Characteristic | Derivation cohort (n=2242) | Validation cohort (n=1113) |
---|---|---|
Age (years) | 61.7±11.5 | 61.7±11.7 |
Male gender (n) | 1747 (78%) | 885 (80%) |
Coronary artery disease (n) | 1687 (75%) | 845 (76%) |
Left ventricle ejection fraction (%) | 41.6±16.1 | 41.3±16.5 |
β-blocker use (n) | 1067 (48%) | 531 (48%) |
Microvolt T-wave alternans result (n) | ||
Positive | 651 (29%) | 345 (31%) |
Negative | 1197 (53%) | 593 (53%) |
Indeterminate | 394 (18%) | 175 (16%) |
Duration of follow-up (months) | 20.4±6.0 | 20.4±6.3 |
Data are presented as mean±standard deviation or n (%).