Table 4.
Correlation between serum calcium level and PSQI components.
| Serum Calcium Level | ||||
|---|---|---|---|---|
| PSQI Complex | Shift Workers (n = 150) |
Non-Shift Workers (n = 203) |
||
| r | p-Value | r | p-Value | |
| Component 1; subjective sleep quality | 0.040 | 0.627 | 0.018 | 0.794 |
| Component 2; sleep latency | −0.041 | 0.619 | 0.016 | 0.824 |
| Component 3; sleep duration | 0.004 | 0.959 | −0.049 | 0.491 |
| Component 4; habitual sleep efficiency | −0.019 | 0.817 | 0.020 | 0.775 |
| Component 5; sleep disturbance | −0.017 | 0.834 | 0.020 | 0.780 |
| Component 6; use of sleep medicine | −0.171 | 0.036 * | 0.014 | 0.837 |
| Component 7; daytime dysfunction | −0.201 | 0.014 * | −0.010 | 0.888 |
Data are presented as r and p-value. r, Pearson’s correlation coefficient. * p < 0.05 denotes statistical significance.