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10.1007/s10964-013-9941-5. 23532598 15 Valdez ES, Valdez L, Korchmaros J, Garcia DO, Stevens S, Sabo S, Carvajal S. Socioenvironmental risk factors for adolescent marijuana use in a United States-Mexico border community. Prevalence of youth substance use is increasing, including risky forms of use such as polysubstance (Zuckermann et al., [17]) and daily use (National Institute on Drug Abuse, [10]). Higher sum scores indicate lower overall support Analysis Descriptive statistics for demographic and socioenvironmental exposure variables were stratified by substance use frequency (daily use/non-daily use) and tested with t-tests or chi-squared tests as appropriate. Those who used daily were more likely to be older, male, and living with a single parent compared to those who did not use or used non-daily. [Extracted from the article]