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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
  1. Notes: CES-D: German version of the Centre for Epidemiological Studies Depression Scale (CES-D, [35, 36]) without item 11 representing intensity of sleep problems; Spearman-Brown correlation coefficients are given
  2. **p = 0.01