Relative risk of cardiac death according to age for a decrease in SDNN
| SDNN | p Value | RR of cardiac death (95% CI) | ||||||
|---|---|---|---|---|---|---|---|---|
| Survivors | Non-survivors | |||||||
| Age < 50 (n = 47) | 110.5 (48.0) | 75.9 (57.5) | 0.009 | 1.036 (1.002-1.072) | ||||
| Age > 50 (n = 75) | 96.0 (32.5) | 79.6 (25.0) | 0.02 | 1.027 (1.003-1.053) | ||||
p value based on proportional hazards model.
Risk ratios (RR) are calculated for a decrease in SDNN equal to 1 ms.