Predictive validity of the Infant Toddler Checklist in primary care at the 18-month visit and developmental diagnosis at 3-5 years: a prospective cohort study.

The ITC had high specificity, high negative predictive value, low false positive rate, and identified children with later developmental delay and ASD. The ITC had low sensitivity, similar to other screening tools underscoring the importance of continuous developmental surveillance at all health supervision visits.