Computation of Nonlinear Parameters of Heart Rhythm Using Short Time ECG Segments

Table 3

Means (standard deviations) of correlation entropy using different sampling times.

Sampling time	= 100 ms	= 125 ms	= 200 ms	= 250 ms
Embedding dimension	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
m = 1	9,764 (1,123)	9,829 (1,139)	9,751 (1,202)	9,868 (1,185)
m = 2	9,407 (1,360)	9,204 (1,291)^*	8,709 (1,232)^*	8,418 (1,183)^*
m = 3	7,766 (0,930)^*	7,486 (0,852)^*	7,066 (0,861)^*	6,806 (0,877)^*
m = 4	6,493 (0,941)^*	6,612 (0,975)^*	5,771 (0,717)^*	5,750 (0,758)^*
m = 5	5,664 (0,846)^*	5,788 (0,701)^*	5,346 (0,514)	5,109 (0,829)^*
m = 6	4,951 (0,790)^*	5,114 (0,719)^*	4,917 (0,714)	4,448 (0,660)^*
m = 7	4,580 (0,927)	4,553 (0,770)^*	4,146 (0,917)^*	4,285 (0,828)
m = 8	4,215 (0,691)	4,423 (0,570)	3,983 (0,697)	4,006 (0,626)
m = 9	4,140 (0,663)	3,905 (0,458)^*	3,617 (0,776)	3,402 (0,590)^*
m = 10	3,927 (0,783)	3,926 (0,645)	3,477 (0,739)	3,210 (0,492)
m = 11	3,867 (0,749)	3,809 (0,548)	3,167 (0,721)	3,178 (0,581)
m = 12	3,674 (0,622)	3,579 (0,492)	3,111 (0,651)	3,050 (0,505)
m = 13	3,665 (0,708)	3,296 (0,634)	2,993 (0,661)	2,757 (0,642)
m = 14	3,565 (0,645)	3,255 (0,676)	2,977 (0,592)	2,665 (0,470)
m = 15	3,428 (0,552)	3,262 (0,663)	2,923 (0,719)	2,574 (0,492)

Statistically significant changes with m from 1 to 13 (Scheffé’s test, P < 0.05).