Concurrent validity of the Warner Initial Developmental Evaluation of Adaptive and Functional Skills and the Bayley Scales of Infant and Toddler Development, Third Edition.

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To determine the concurrent validity of the Warner Initial Developmental Evaluation of Adaptive and Functional Skills (WIDEA-FS), a criterion-specified questionnaire that assesses a child's adaptive skills in everyday contexts, and the Bayley Infant and Toddler Scales of Development, Third Edition (Bayley-III). In a prospective cohort study, 431 WIDEA-FS and Bayley-III assessments were completed among 341 children, aged 10 to 36months corrected age (158 females, 183 males; median [interquartile range] gestational age at birth 32wks [29-38]), monitored in a high-risk neonatal intensive care unit follow-up clinic. WIDEA-FS scores were significantly associated with Bayley-III scores in all domains. Lower scores on the WIDEA-FS were significantly associated with an increased risk of adverse developmental performance on all Bayley-III scales. The association was strongest for motor and language Bayley-III scores when tested at <30months of age, and for cognitive Bayley-III scores when tested at ≥30months of age. The WIDEA-FS has concurrent validity with the Bayley-III and may be a useful tool in high-risk follow-up settings. WIDEA-FS mobility, communication, and social cognition domains are concurrently valid in infants at high-risk for neurodevelopmental disability. Bayley-III motor, language, and cognitive composite scores are concurrently valid in the same group. The WIDEA-FS mobility and communication domains may be most clinically useful in children <30months.