A 3-level variable representing individuals who had no treatment, who received professional treatment with or without AA attendance (cell counts were too small to create a separate category for professional treatment only) or who received AA-only was created for baseline and follow-up based on lifetime history at each assessment. Individuals whose treatment category was the same at both time points were categorized as stable for that treatment category. Individuals who endorsed no treatment at baseline and AA at follow-up were coded as receiving “new AA-only” and those who endorsed no treatment or AA-only at baseline and professional treatment at follow-up were coded as having received “new professional treatment.”
