Table 2.
Results of the correlation between heart rate variability indices and VAS scale of perceived stress.
| W_NOKID | W_KID | |||||||
|---|---|---|---|---|---|---|---|---|
| r | p | ρ | p | r | p | ρ | p | |
| μRR during DAY (ms) | − 0.336 | 0.101 | 0.220 | 0.287 | − 0.009 | 0.965 | 0.033 | 0.873 |
| σ2RR during DAY (ms2) | − 0.089 | 0.670 | 0.075 | 0.717 | 0.001 | 0.999 | − 0.063 | 0.761 |
| HFRR during DAY (ms2) | − 0.028 | 0.894 | 0.066 | 0.750 | − 0.062 | 0.768 | 0.032 | 0.876 |
| μRR during NIGHT (ms) | − 0.139 | 0.508 | − 0.197 | 0.341 | 0.171 | 0.413 | 0.220 | 0.287 |
| σ2RR during NIGHT (ms2) | − 0.053 | 0.801 | − 0.028 | 0.890 | − 0.154 | 0.464 | 0.075 | 0.717 |
| HFRR during NIGHT (ms2) | − 0.014 | 0.946 | − 0.096 | 0.644 | − 0.166 | 0.428 | 0.067 | 0.750 |
W_NO KID, women without preschoolers; W_KID, women with preschoolers; RR, RR interval; μRR, mean of RR; σ2RR, RR variance; HFRR, absolute power in high frequency band of the RR; DAY, daytime; NIGHT, nighttime; r, Pearson product moment correlation coefficient; ρ, Spearman rank correlation coefficient; p, type I error probability. Data are presented as mean ± standard deviation.