Abstract
To the Editor .— Pediatricians might be swayed to not select the Ages & Stages Questionnaire (ASQ) because of the conclusions of the Rydz et al1 study of the 18-month ASQ psychometric properties (sensitivity: 0.67; specificity: 0.39; positive predictive value: 34%; negative predictive value: 71%). Should we accept these results and choose another tool? My opinion is that we should not. 1. Neither the Battelle Development Inventory nor the English ASQ was well matched to the study's suburban, largely middle-class population from Quebec, Canada. The ASQ was …
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