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The variables included in bivariate analyses were as follows: in the first level, social class, maternal age, type of delivery, infant sex, prematurity, birth weight, smoking, alcohol consumed in last year; in the second level, history of affective disorders, postpartum affective disorder (PPAD), type of PPAD episode, mother anxiety disorder, mother BDNF level, mother NGF level, mother IL-6 level, mother and infant cortisol levels.
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