Exploratory phenotypic factor analysis was performed on the individual phenotypic data in Mplus with varimax rotation. Overall model fit was evaluated using the Tucker-Lewis Index (TLI),25 the Comparative Fit Index (CFI),26 and the root mean square error of approximation (RMSEA).27 For the TLI and CFI, values between 0.90 and 0.95 are considered acceptable and 0.95 or more, as good. For the RMSEA, good models have values of 0.05 or less.
