Early Language Milestone Scale and Language Screening

Walker et al made a contribution by calling attention to the importance of validation of screening tests in their article. However, the paper had three major shortcomings. First, the authors inappropriately cite a limitation of the Denver Developmental Screening Test (DDST) based on a report by Borowitz and Glascoe. The Borowitz-Glascoe study has three major methodologic biases that invalidate its conclusions: One is failure to interpret the DDST in the prescribed manner—the authors wrongly compared their criterion tests with only one sector of the DDST.