Table 3. Correlation between linear and MSE parameters.
| Total (n = 137) |
PD (n = 65) |
Control (n = 72) |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Slope 1–5 | Scale 5 | Area 1–5 | Area 6–20 | Slope 1–5 | Scale 5 | Area 1–5 | Area 6–20 | Slope 1–5 | Scale 5 | Area 1–5 | Area 6–20 | |
| SDRR, ms | 0.078 | 0.313* | 0.320* | 0.210# | 0.234 | 0.141 | 0.081 | 0.122 | −0.122 | −0.044 | 0.048 | −0.145 |
| pNN50, % | −0.136 | 0.367* | 0.480* | 0.192# | −0.044 | 0.189 | 0.262# | 0.046 | −0.340¥ | 0.356¥ | 0.529* | 0.144 |
| pNN20, % | −0.129 | 0.491* | 0.604* | 0.317* | 0.017 | 0.408* | 0.452* | 0.272# | −0.425* | 0.369* | 0.593* | 0.161 |
| Very low frequency | 0.245¥ | 0.294* | 0.223¥ | 0.247¥ | 0.413* | 0.217 | 0.044 | 0.248# | 0.100 | 0.323¥ | 0.322¥ | 0.254# |
| Low frequency | 0.388* | 0.533* | 0.448* | 0.433* | 0.535* | 0.397* | 0.225 | 0.402* | 0.254# | 0.517* | 0.465* | 0.335¥ |
| High frequency | −0.125 | 0.363* | 0.477* | 0.204# | 0.064 | 0.269# | 0.301# | 0.176 | −0.324¥ | 0.383* | 0.581* | 0.165 |
Values are correlation coefficients; *p < = 0.001; ¥p < 0.01; #p < 0.05. SDRR = standard deviation of normal RR intervals; pNN20 = percentage of the absolute change in consecutive normal RR interval exceeds 20 ms; pNN50 = percentage of the absolute change in consecutive normal RR interval exceeds 50 ms.