Table 1.
Correlation coefficients between sleep, depression, and cognitive performance variables.
| V1 | V2 | V3 | V4 | V5 | V6 | V7 | V8 | V9 | V10 | V11 | V12 | V13 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| V1 | − | ||||||||||||
| V2 | 0.16 * | − | |||||||||||
| V3 | 0.18 ** | 0.21 ** | − | ||||||||||
| V4 | −0.10 | −0.17 ** | −0.18 ** | − | |||||||||
| V5 | 0.10 | 0.20 ** | 0.33 **** | −0.26 **** | − | ||||||||
| V6 | −0.03 | −0.08 | −0.07 | 0.86 **** | 0.15 * | − | |||||||
| V7 | −0.03 | −0.01 | −0.18 ** | 0.64 **** | −0.25 *** | 0.53 **** | − | ||||||
| V8 | 0.06 | 0.24 *** | 0.34 **** | −0.36 **** | 0.55 **** | −0.11 | −0.30 **** | − | |||||
| V9 | −0.02 | 0.13 | −0.03 | 0.44 **** | 0.02 | 0.51 **** | 0.82 **** | 0.14 * | − | ||||
| V10 | −0.15 * | −0.07 | 0.07 | 0.11 | −0.06 | 0.07 | 0.23 *** | −0.14 * | 0.14 * | − | |||
| V11 | −0.22 *** | −0.06 | 0.01 | 0.10 | −0.20 ** | −0.01 | 0.22 ** | −0.17 * | 0.13 * | 0.61 **** | − | ||
| V12 | −0.04 | −0.04 | 0.04 | 0.01 | −0.02 | 0.02 | 0.16 * | −0.10 | 0.10 | 0.57 **** | 0.47 **** | − | |
| V13 | 0.06 | −0.01 | 0.08 | 0.02 | −0.11 | −0.01 | 0.16 * | −0.13 * | 0.08 | 0.61 **** | 0.43 **** | 0.59 **** | − |
Abbreviations: V1 = age; V2 = daytime sleepiness; V3 = sleep quality; V4 = euthymia-state; V5 = dysthymia-state; V6 = state total score; V7 = euthymia-trait; V8 = dysthymia-trait; V9 = trait total score; V10 = inductive reasoning; V11 = reading comprehension; V12 = problem-solving; V13 = number and calculation. * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001.