Table 2.
Meta-regression analyses of the effects of potential variables
| Variable | HF-HRV |
RMSSD |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | Coefficient | SE | Z | P | N | Coefficient | SE | Z | P | |
| Year | 15 | -0.109 (-0.272, -0.055) | 0.084 | -1.30 | 0.194 | 10 | -0.281 (-0.697, 0.135) | 0.212 | -1.32 | 0.186 |
| Quality | 15 | 0.692 (-0.067, 1.451) | 0.387 | 1.79 | 0.074 | 10 | 0.374 (-0.515, 1.263) | 0.453 | 0.83 | 0.409 |
| Age | 13 | -0.080 (-0.198, 0.038) | 0.060 | -1.33 | 0.184 | |||||
| BDI | 10 | 0.016 (-0.186, 0.218) | 0.103 | 0.16 | 0.874 | |||||
| Proportion of male participants | 13 | -0.005 (-0.037, 0.028) | 164.4 | 1.30 | 0.195 | 10 | -0.019 (-0.054, 0.016) | 0.018 | -1.07 | 0.187 |
Stata 15.0 was used for meta-regression. HF-HRV: high-frequency heart rate variability, RMSSD: root mean square of successive R-R interval differences, BDI: Beck Depression Scale