Goodness-of-fit statistics from single cohorts (MA, OA) and multi-group (MA+OA) SEMs assessing the ASRS factor structure.

MA: middle-age cohort; OA: older-age cohort; FL: Factor loadings of ASRS items on Inatt and Hyperact latent factors; FV: Factor variance for Inatt and Hyperact; FC: Covariance between Inatt and Hyperact; VInatt: Variance of Inatt; VHyperact: Variance of Hyperact; RV: Residual Variance of ASRS items.RMSEA: root-mean square error of approximation (optimal value 0.9); CFI: comparative fit index (optimal value >0.9); AIC: Akaike information criterion; BCC: Browne-Cudeck criterion. Models with the lowest values for AIC and BCC are considered to have the best fit to the data.acompared to Model 1;bcompared to Model 2;ccompared to Model 4.