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Prevalence of parent-reported diagnosed syndromes and/or sequences and structural and functional anomalies between ages 18 months and 5 years. Note: Due to the possibility of late diagnosis, descriptive analysis on the prevalence of syndromes and structural and functional anomalies were performed at ages 18 months, 3 years and 5 years for a sub-sample of children where data had been received for all three timepoints.
