title: Reliability and validity of young adults' anonymous online reports of marijuana use and thoughts about use.
abstract: With growing interest in online assessment of substance abuse behaviors, there is a need to formally evaluate the validity of the data gathered. The current investigation evaluated the reliability and validity of anonymous, online reports of young adults' marijuana use and related cognitions. Young adults age 18 to 25 who had smoked at least one cigarette in the past 30 days were recruited over 14 months to complete an anonymous online survey. Of 3,106 eligible cases, 1,617 (52%) completed the entire survey. Of those, 54% (n = 884) reported past-month marijuana use (65% male, 70% Caucasian, mean age was 20.4 years [SD = 2.0]). Prevalence of marijuana use was reported reliably across three similar items, and interitem correlations ranged from fair to excellent for measures of marijuana dependence symptoms and thoughts about marijuana use. Marijuana use frequency demonstrated good construct validity through expected correlations with marijuana use constructs, and nonsignificant correlations with thoughts about tobacco use. Marijuana frequency distinguished among stages of change for marijuana use and goals for use, but not among gender, ethnicity, or employment groups. Marijuana use and thoughts about use differed by stage of change in the hypothesized directions. Self-reported marijuana use and associated cognitions reported anonymously online from young adults are generally reliable and valid. Online assessments of substance use broaden the reach of addictions research.
authors.affiliation: Department of Psychiatry, University of California, San Francisco, 401 Parnassus Avenue, Box CPT 0984, San Francisco, CA 94143, USA. danielle.ramo@ucsf.edu
authors.forename: Danielle E
authors.initials: DE
authors.lastname: Ramo
authors.forename: Howard
authors.initials: H
authors.lastname: Liu
authors.forename: Judith J
authors.initials: JJ
authors.lastname: Prochaska
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D020407:Internet; D008297:Male; D002189:Marijuana Abuse / Q000453:epidemiology* / Q000523:psychology; D008385:Marijuana Smoking / Q000453:epidemiology* / Q000523:psychology; D015995:Prevalence; D015203:Reproducibility of Results; D057566:Self Report; D011795:Surveys and Questionnaires
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