Screening Broad Mental Health Problems Among Adolescents: Bifactor Modeling of the YIEPS
Internalizing and externalizing problems are common targets for school mental health screening. The Youth Internalizing Problems Screener (YIPS) and the Youth Externalizing Problems Screener (YEPS) were developed separately yet intended as companion self-report screeners. Prior research supports the interpretation of total scores derived from both measures. We extended previous work by investigating the defensibility of a series of integrated measurement models that combined items from the YIPS and YEPS into a single, unified screener (YIEPS). Specifically, we evaluated the viability of (1) a unidimensional measurement model with one factor representing global mental health problems, (2) a correlated-factors model with two latent variables representing internalizing and externalizing problems, and (3) a bifactor model with two specific factors (i.e., internalizing and externalizing) and a general factor representing global mental health problems. Following, we tested the reliabilities of the several factors represented in these models as well as the informational value-added of these competing models. Results indicated that a bifactor YIEPS measurement model had the best data-model fit when integrating the two screeners. However, exploratory analyses suggested a revised alternative bifactor model with three specific factors—parsing attention problems from other externalizing and internalizing content—might be a better bifactor model than the original. Ultimately, we recommend the integrated YIEPS is best understood as measuring three specific factors and one general factor. Reliability findings further suggest the general factor (i.e., global Mental Health Problems) is the most defensible. Future directions for research and practice are discussed.