A Twin Factor Mixture Modeling Approach to Childhood Temperament: Differential Heritability

Twin factor mixture modeling was used to identify temperament profiles while simultaneously estimating a latent factor model for each profile with a sample of 787 twin pairs (M-age=7.4years, SD=.84; 49% female; 88.3% Caucasian), using mother- and father-reported temperament. A four-profile, one-factor model fit the data well. Profiles included regulated, typical reactive, well-regulated, positive reactive, regulated, surgent, and dysregulated, negative reactive. All profiles were heritable, with lower heritability and shared environment also contributing to membership in the regulated, typical reactive and dysregulated, negative reactive profiles.