Public Domain Data Used in Table 1, Past-Year Prevalence

ONLINE APPENDIX

Public domain data used in Table 1, past-year prevalence

Variable names, and variable labels for NCS and NCS-R public domain data: NCS-1 and NCS-R data were downloaded at 1.30 p.m. on 9 February 2007

Depression NCS-1 DEPYR1 Major depression w/o hierarchy NCS-R D_MDE12 DSM-IV Major Depressive Episode (12 months)

Any Anxiety NCS-1 ANYANX1_12 includes Panic, Specific or Social phobia, GAD, Agoraphobia without panic disorder (according to Kessler et al. 1994). NCS-R D_ANYANX1 includes Panic, Specific or Social phobia, GAD, Agoraphobia without panic disorder, PTSD and Adult/Child Separation Anxiety Disorder (according to Kessler et al. 2005). Because additional anxiety disorders were only assessed in Part II of the survey, the total n for this variable is reduced (n = 1728).

Panic NCS-1 PDYR 12-month panic disorder NCS-R D_PDS12 DSM-IV Panic Disorder (12 months)

Specific Phobia NCS-1 SIMYR 12-month simple phobia NCS-R D_SP12 DSM-IV Specific Phobia (12 months)

Social Phobia NCS-1 SOCYR 12-month social phobia NCS-R D_SO12 DSM-IV Social Phobia (12 months) GAD NCS-1 GADYR1 12-month generalized anxiety disorder w/o hierarchy NCS-R D_GAD12 DSM-IV Generalized Anxiety Disorder (12 months)

Alcohol dependence NCS-1 ALCDYR1 12-month alcohol dependence broad NCS-R D_ALD12 DSM-IV Alcohol Dependence (12 months). Because alcohol dependence was only assessed in Part II of the survey the total n for this variable is reduced (n = 1728).

Cannabis Dependence NCS-1 DRGDYR1 12-month drug dependence broad NCS-R Var – D_DRD12 DSM-IV Drug Dependence (12 months). Because cannabis dependence was only assessed in Part II of the survey, the total n for this variable is reduced (n = 1728).

Public domain data used in Table 2, Lifetime prevalence

Variable names, and variable labels for NCS and NCS-R public domain data: NCS-1 and NCS-R data were downloaded on 1.30 p.m. 9 February 2007

Depression NCS-1 DEPLT1 Major depression w/o hierarchy NCS-R DSM_MDE DSM-IV Major Depressive Episode (lifetime)

Any Anxiety NCS-1 ANYANXF1 NCS-R DSM_ANYANXF1 Panic Disorder NCS-1 PDLT Panic disorder NCS-R DSM_PDS DSM-IV Panic Disorder (lifetime)

Specific Phobia NCS-1 SIMLT Simple phobia NCS-R DSM_SP DSM-IV Specific Phobia (lifetime)

Social Phobia NCS-1 SOCLT Social phobia NCS-R DSM_SO DSM-IV Social Phobia (lifetime)

GAD NCS-1 GADLT1 Generalized anxiety disorder w/o hierarchy NCS-R DSM_GAD DSM-IV Generalized Anxiety Disorder (lifetime)

Alcohol Dependence NCS-1 ALCDLT Alcohol dependence NCS-R DSM_ALD DSM-IV Alcohol Dependence (lifetime)

Cannabis Dependence NCS-1 DRGDLT drug dependence NCS-R DSM_DRD DSM-IV Drug Dependence (lifetime) Both NCS files have only derived variables for drug dependence, which includes cannabis dependence, but also other drugs.