All statistical analyses were completed with the SUDAAN software package and utilize the Taylor series linearization method to take into account the complex survey design. Cross-tabulations were used to calculate prevalence and comorbidity. Logistic regression analysis was used to examine demographic correlates of prevalence; regression models included all sociodemographic variables simultaneously, and adjusted odds ratios are presented. Age-of-onset curves were generated using the Kaplan-Meier survival analysis method. Multivariate significance tests were calculated using Wald Chi-Square tests based on coefficient variance-covariance matrices that were adjusted for design effects using the Taylor series method. Statistical significance was based on two-sided design-based tests evaluated at a level of significance of 0.05.
