The 2012 data for 19 variables at the Atlantic Provinces and/or Prairie Provinces levels have been corrected. Data at the province and Canada level were not affected. The 19 corrected variables are: Any selected disorder (mental or substance), life; Any selected disorder (mental or substance), 12 months; Any mood disorder, life; Major depressive episode, life; Generalized anxiety disorder, life; Any substance use disorder (alcohol or drug), life; Any substance use disorder (alcohol or drug), 12 months; Alcohol abuse or dependence, life; Alcohol abuse or dependence, 12 months; Cannabis use, life; Self-rated work stress, days a bit stressful; Self-rated work stress, days not at all or not very stressful; Perceived need for mental health care, no need; Perceived need for mental health care, all needs met; Perceived mental health, very good or excellent; Perceived mental health, good; Post-traumatic stress disorder, current diagnosed condition; Eating disorder, current diagnosed condition; and Attention deficit disorder, current diagnosed condition.