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The cerebral palsy prevalence,based on neonatal survival,dropped from 157 per 1000 to 93 per 1000.Analysis by birth weight-specific categories in 250-g increments did not alter results,but disability rates were highest for those of lowest weight.In contrast to other reports this population- based North American study from a well-developed perinatal regional program reports no increase in incidence,complexity,or severity of disability in preterm infants weighing 500 through 1250 g at birth. |
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