Table 5.
Associations between sleep quality, HRV parameters, and participants’ demographics.
| Variables | Age | Nursing Seniority | Heart Rate | SDNN | RMSSD | TP | LF | HF | LF/HF | PSQI Global Score |
|---|---|---|---|---|---|---|---|---|---|---|
| Age | 1 | |||||||||
| Nursing seniority | 0.921 ** | 1 | ||||||||
| Heart rate | −0.089 | −0.120 | 1 | |||||||
| SDNN | −0.098 | −0.102 | −0.555 ** | 1 | ||||||
| RMSSD | −0.103 | −0.103 | −0.668 ** | 0.878 ** | 1 | |||||
| TP | −0.210 | −0.217 | −0.338 ** | 0.790 ** | 0.653 ** | 1 | ||||
| LF | −0.099 | −0.088 | −0.232 | 0.445 ** | 0.302 * | 0.717 ** | 1 | |||
| HF | −0.244 * | −0.277 * | −0.377 ** | 0.570 ** | 0.633 ** | 0.593 ** | 0.180 | 1 | ||
| LF/HF | −0.006 | 0.017 | 0.038 | 0.273 * | 0.116 | 0.372 ** | −0.036 | −0.149 | 1 | |
| PSQI global score | 0.025 | 0.024 | −0.124 | −0.185 | −0.075 | −0.425 ** | −0.269 * | −0.147 | −0.266 * | 1 |
* p < 0.05; ** p < 0.01; SDNN: standard deviation of normal to normal HRV; RMSSD: root mean square of the successive difference in HRV; TP: total power HRV; LF: low-frequency HRV; HF: high-frequency HRV; LF/HF: low-frequency power to high-frequency power ratio; PSQI: Pittsburgh Sleep Quality Index.