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Longitudinal language groups as a function of the ratio of consecutive daytime sleep/consecutive nighttime sleep (CDS/CNS) at 6 and 18 months. Children with persistent or late language delays (■ N = 140) differed significantly from children without language delays (☐ N = 385) and from children with transient delays (
N = 93) on both the 6- and 18-month sleep ratio. Sleep ratio was adjusted for gestation duration corrected age.
