From: Loss of lag-response curvilinearity of indices of heart rate variability in congestive heart failure
Beat sequence length | SD1 | SD2 | SD1/SD2 ratio | ||||||
---|---|---|---|---|---|---|---|---|---|
CHF | Normal | p | CHF | Normal | p | CHF | Normal | p | |
50 | 0.0474 (0.636) | 0.0222 (0.0319) | 0.2270 | 0.0600 (0.0677) | 0.0531 (0.0342) | 0.2144 | 0.7503 (0.3518) | 0.4013 (0.2305) | 2 × 10-6 |
100 | 0.0496 (0.0605) | 0.0228 (0.0315) | 0.1150 | 0.0640 (0.0619) | 0.0595 (0.0302) | 0.2215 | 0.6949 (0.3212) | 0.3660 (0.2447) | 3 × 10-6 |
500 | 0.0541 (0.0626) | 0.0249 (0.0247) | 0.0696 | 0.0779 (0.0627) | 0.0790 (0.0351) | 0.2517 | 0.6640 (0.3278) | 0.3181 (0.2086) | 9 × 10-6 |
1000 | 0.0505 (0.0559) | 0.0248 (0.0224) | 0.1004 | 0.0784 (0.0576) | 0.0907 (0.0367) | 0.0449 | 0.6243 (0.3285) | 0.2727 (0.1726) | 2.5 × 10-6 |
5000 | 0.0467 (0.0366) | 0.0231 (0.0169) | 0.0043 | 0.0817 (0.0427) | 0.1082 (0.0354) | 0.0047 | 0.5534 (0.2532) | 0.2146 (0.1240) | 4 × 10-9 |
10000 | 0.0483 (0.0341) | 0.0221 (0.0146) | 0.0008 | 0.0835 (0.0401) | 0.1125 (0.0333) | 0.0042 | 0.5457 (0.2328) | 0.1967 (0.0972) | 2 × 10-10 |
50000 | 0.0477 (0.0310) | 0.0253 (0.0196) | 0.0003 | 0.0982 (0.0558) | 0.1522 (0.0519) | 6 × 10-6 | 0.5094 (0.2394) | 0.1692 (0.0923) | 4 × 10-10 |
Spearman's rho | 0.1766 | 0.2154 | 0.6577 | 0.3157 | 0.6643 | 7 × 10-5 | -0.2395 | -0.4900 | 0.0042 |