Table 2 Correlation coefficient matrix of serum 25(OH) D concentrations, CES-D sum scores (after removing item 11 (sleep problems)) and night sleep parameters (night sleep duration, midsleep time) in the final sample (N = 1252)
From: The effect of depressive symptomatology on the association of vitamin D and sleep
CES-D sum score | Serum 25 (OH) D con-centration | Night sleep duration | Midsleep time | |
|---|---|---|---|---|
CES-D sum score | 1 | −0.05 | 0.02 | −0.01 |
Serum 25(OH) D concentration | – | 1 | 0.08** | −0.02 |
Night sleep duration | – | – | 1 | − 0.02 |
Midsleep time | – | – | – | 1 |