Multiple developmental assessments were made at 4-month intervals over the first year of life for 2 groups of infants born at risk and 1 normal group. The groups included 46 preterm respiratory distress syndrome infants, 46 postterm postmaturity syndrome, and 59 term normal infants. The mothers were white, multiparous, middle-class, high school graduates averaging 25 years of age. Analyses of group differences revealed that the preterm respiratory distress syndrome (RDS) infants continued to exhibit delays in motor and mental development and the postmature infants in mental development. Discriminant function analyses suggesting that the most efficient predictors and accurate discriminators of continuing risk were as follows: the Parmelee obstetric and postnatal complications scores and the Brazelton interactive and motoric process scores at birth; the Denver rating, mother-infant interaction and Carey temperament ratings at 4 months; and the Bayley mental and motor scores at 8 months. On the basis of their weighted assessment scores, infants were assigned a cumulative risk index at each assessment period.
The onset of rhythmic activities was compared for 2 groups of high-risk infants (a preterm Respiratory Distress Syndrome and a postterm postmature group) and a normal term group over their 1st year of life. The postterm postmature group experienced earlier onsets of rhythmic activities. The preterm RDS group showed delays in the onset of rhythmic activities, but when a correction was made for the prematurity, did not differ from the other groups. These differences suggest that the onset dates for rhythmic activities are not affected by the perinatal complications of RDS or postmaturity, but are related to gestational age differences. A comparison of the 3 groups on Bayley 1st-year motor skills revealed group differences even after an adjustment for gestational age differences, suggesting that the development of motor skills, unlike the development of rhythmic activities, may have been affected by these perinatal complications.
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