Table 4 Correlation between variables (N = 198)
| Â | Age | GPA | BMI | Chronotype | Social jetlag | Sleep duration | Light exposure | Depression symptoms | QOL |
|---|---|---|---|---|---|---|---|---|---|
| Â | r(p) | r(p) | Â | Â | r(p) | r(p) | r(p) | r(p) | r(p) |
Age | 1 | Â | Â | Â | Â | Â | Â | Â | Â |
GPA | 0.131 (0.065) | 1 | Â | Â | Â | Â | Â | Â | Â |
BMI | 0.05 (0.487) | − 0.14 (0.043) | 1 |  |  |  |  |  |  |
Chronotypea | 0.19 (0.008) | 0.05 (0.525) | − 0.02 (0.764) | 1 |  |  |  |  |  |
Social jetlag | − 0.07 (0.348) | − 0.07 (0.360) | − 0.11 (0.123) | − 0.23 (0.001) | 1 |  |  |  |  |
Sleep duration | − 0.07 (0.318) | 0.02 (0.809) | 0.01 (0.845) | 0.17 (0.014) | − 0.16 (0.022) | 1 |  |  |  |
Light exposure | 0.14 (0.046) | 0.11 (0.128) | 0.02 (0.837) | 0.09 (0.220) | − 0.01 (0.857) | 0.10 (0.148) | 1 |  |  |
Depression symptoms | − 0.07 (0.298) | − 0.23 (0.001) | 0.06 (0.383) | − 0.13 (0.080) | 0.34 (< 0.001) | − 0.09 (0.214) | − 0.05 (0.517) | 1 |  |
QOL | − 0.17 (0.017) | 0.14 (0.050) | − 0.05 (0.454) | 0.11 (0.111) | − 0.31 (< 0.001) | 0.06 (0.377) | 0.08 (0.275) | − 0.40 (< 0.001) | 1 |