Table 7. Correlations between sample entropy (2, 0.2) and various measures of variance.
| 300 min | P | 256 h | P | ||
| Control | SD | −0.760 | <0.001 | −0.479 | 0.006 |
| RMSSD | −0.513 | 0.003 | −0.250 | 0.167 | |
| RMSSD/SD | 0.361 | 0.042 | 0.176 | 0.334 | |
| Fourier analysis 4–8 min | −0.041 | 0.823 | |||
| Fourier analysis 26–256 h/2–21 h | −0.199 | 0.275 | |||
| Schizophrenia | SD | −0.756 | <0.001 | −0.567 | 0.005 |
| RMSSD | −0.632 | 0.001 | 0.093 | 0. 674 | |
| RMSSD/SD | 0.205 | 0.336 | 0.620 | 0.002 | |
| Fourier analysis 4–8 min | 0.246 | 0.247 | |||
| Fourier analysis 26–256 h/2–21 h | −0.408 | 0.053 | |||
| Depression | SD | −0.678 | <0.001 | −0.512 | 0.013 |
| RMSSD | −0.415 | 0.039 | −0.271 | 0.211 | |
| RMSSD/SD | 0.463 | 0.020 | 0.157 | 0.473 | |
| Fourier analysis 4–8 min | 0.465 | 0.019 | |||
| Fourier analysis 26–256 h/2–21 h | -0.321 | 0.135 |