All analyses were conducted using SUDAAN software (Research Triangle Institute, 2006) to account for complex sample design effects that differed between the two surveys. The prevalence estimates and their standard errors were obtained with sampling weights taken into consideration. Significant (p<0.05) country differences were assessed by t-statistics or Chi-squared tests, as appropriate. Odds ratios and 95% confidence intervals (CIs) were estimated to describe the strength of comorbid associations between pairs of the 12-month AUD, ND and mood and anxiety disorders, while adjusting for all sociodemographic characteristics in multivariable logistic models specific to each country.
