Table 1.
Statistical values of Spearman correlation tests between quantitative dependent variables considering all groups together [good sleep (GS), poor sleep (PS) and sleep disturbance (SD)].
| CAR | BDNF | PSQI | Latency | Duration | Sleepiness | Duration D1 | |
|---|---|---|---|---|---|---|---|
| MADRS | −0.520* | 0.060 | 0.720* | 0.520* | −0.310* | 0.009 | −0.020 |
| CAR | - | −0.060 | −0.340* | 0.220 | −0.240 | 0.170 | 0.090 |
| BDNF | −0.60 | - | 0.020 | −0.020 | −0.150 | 0.080 | 0.060 |
| PSQI | −0.340* | 0.020 | - | - | - | 0.160 | −0.080 |
| Latency | −0.240 | −0.020 | - | - | - | −0.070 | 0.100 |
| Duration | 0.220 | −0.150 | - | - | - | −0.170 | 0.130 |
| Sleepiness | 0.170 | 0.080 | 0.160 | −0.070 | −0.170 | - | 0.140 |
Molecular biomarkers: blood brain-derived neurotrophic factor (BDNF) and salivary cortisol awakening response (CAR). Depressive symptoms: Montgomery–Åsberg Depression Scale (MADRS). Sleep quality: total Pittsburgh Sleep Quality Index (PSQI), latency to sleep (from PSQI), sleep duration (from PSQI and at D1), and daytime sleepiness. D1: hospital overnight; groups: sleep disturbance (SD, n = 18), poor sleep (PS, n = 18), and good sleep (GS, n = 21). Bold text indicates significance: p ≤ 0.05.