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Table 1 Summary of Poincaré plot indices in study subjects.*

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
  1. * Values indicate averages (standard deviations) in seconds.