Dr. Davidson and colleagues established a cutoff of the lowest two quintiles in the social functioning scale for accurately predicting membership in the patient group. These cutoffs have no apparent statistical or conceptual validity, as the authors failed to indicate whether patients in the second quintile differed statistically from patients falling into the third quintile. This overlap between the second and third quintiles for the patient group reduced the sensitivity in predicting behavioral markers for schizophrenia. Moreover, it is unclear how the authors determined this cutoff and if it is applied to the other measures in this study. Assuming that Dr. Davidson et al. applied a similar method in evaluating the other measures, we believe that this application is misleading in identifying subtle predictors of schizophrenia. For example, with "organizational ability" and "interest in physical activity," the extreme rating of "1" robustly distinguishes between groups; however, in ratings 2–5, the differences are not consistently evident. It appears that only extremely small differences between these constructs may be useful as markers in predicting vulnerability to developing schizophrenia.