Table 1:

Sources of national data on time trends in cannabis use and cannabis use disorders.

Survey frequency	Years of comparable data	Ages	Sample sizes	Data collection setting	Data collection mode	Funders	Substance coverage	Other coverage
Monitoring the Future (MTF)
Annual surveys	1991-Present	8th graders	~ 18,000/year	Schoold	Confidential self-administered	NIDAa	Substance use	Questions on mood, anxiety, conduct problems, attitudes and
	1991-Present	10th graders	~ 17,000/year	Schoold	questionnaires			perceptions
	1976-Present	12th graders	~ 16,000/year	Schoold
National Survey on Drug Use and Health (NSDUH)
Annual surveys	2002–2015	12–17 18 and older	~ 23,000/year ~ 47,000/year	Home	Confidential interviewer & self-administered interview	SAMHSAb	Substance use, current DSM-IV substance disorders	Scales on major depression, attitudes and perceptions
National Epidemiologic Surveys on Alcohol and Related Conditions (NESARC)
Three surveys,	1991–1992	18 and	42,862	Home	Confidential	NIAAA,c	Substance use, current,	Current, past, lifetime DSM-IV
one with	(NLAES)	older			interviewer-administered	NIDAb	past, lifetime DSM-lVe	(NESARC) and DSM-5 (NESARC-III)
3-year	2001 −2002	18 and	43,093		interview	co-funding	and (NESARC-III) DSM-5f	psychiatric disorders, trauma,
follow-up	(NESARC	older					substance disorders	family history, discrimination
(NESARC	Wave 1)
Wave 2)	2004–2005 (NESARC Wave 2) 2012–2013 (NESARC-III)	20 and older 18 and older	36,653 36,309

^aNational Institute on Drug Abuse, National Institutes of Health.

^bSubstance Abuse and Mental Health Services Administration.

^cNational Institute on Alcohol Abuse and Alcoholism, National Institutes of Health.

^dQuestionnaires distributed and collected by survey personnel and not available to teachers or school staff.

^eDiagnostic and Statistical Manual, American Psychiatric Association, fourth edition (1994).

^fDiagnostic and Statistical Manual, American Psychiatric Association, fifth edition (2013).