Serum brain-derived neurotrophic factor: determinants and relationship with depressive symptoms in a community population of middle-aged and elderly people.

Although the other somatic co-morbidity variable remained under the P = 0.15 level, it did not reach statistical significance at the P = 0.05 level ( B = 0.47, 95% CI −0.76 to 1.02; t = 1.69, P = 0.091).

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