Use of the Ages and Stages Questionnaire and Bayley Scales of Infant Development-II in neurodevelopmental follow-up of extremely low birth weight infants

Objective:for infants born with extremely low birth weight (elbw), we examined the (1) correlation between results on the ages and stages questionnaire (asq) and the bayley scales of infant development-ii (bsid-ii) at 18 to 22 months corrected age; (2) degree to which earlier asq assessments predict later bsid-ii results; (3) impact of asq use on follow-up study return rates.study design:asq data were collected at 4, 8, 12 and 18 to 22 months corrected age. the bsid-ii was completed at 18 to 22 months corrected age. asq and bsid-ii 18 to 22 month sensitivity and specificity were examined. ability of earlier asqs to predict later bsid-ii scores was examined through linear regression analyses.result:asq sensitivity and specificity at 18 to 22 months were 73 and 65%, respectively. moderate correlation existed between earlier asq and later bsid-ii results.conclusion:for extremely low birth weight infant assessment, the asq cannot substitute for the bsid-ii, but seems to improve tracking success.