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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.