Behaviour problems and developmental status of 3-month-old infants in relation to organic and psychosocial risks

In a prospective longitudinal study starting at birth 384 infants and their families were investigated. The subjects were distributed across the nine cells of a two-factorial design (3 x 3), factor 1 representing the degree of organic, factor 2 the degree of psychosocial risk. At age 3 months there...

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