Data managing and analyses were conducted in SAS statistical software version 9.4 (SAS Institute, Inc) and Stata IC/14.1. We estimated odds ratios (OR) to quantify the association between OCD and TD/CTD and AD with logistic regression analyses. All statistical tests employed two-sided 5% level of significance and associated two-sided 95% Wald-type confidence intervals (CI) were calculated. We employed the robust variance estimator (sandwich estimator) to handle clustering of data.
