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Comparative Study
. 2007 Jul;97(7):1311-8.
doi: 10.2105/AJPH.2005.071266. Epub 2007 May 30.

Marijuana initiation in 2 American Indian reservation communities: comparison with a national sample

Nancy Rumbaugh Whitesell  1 , Janette Beals, Christina M Mitchell, Douglas K Novins, Paul Spicer, Joan O'Connell, Spero M Manson
Affiliations
Comparative Study

Marijuana initiation in 2 American Indian reservation communities: comparison with a national sample

Nancy Rumbaugh Whitesell et al. Am J Public Health. 2007 Jul.

Abstract

Objectives: We examined disparities in age-related patterns of marijuana initiation in 2 culturally distinct American Indian reservation communities (from the Northern Plains and the Southwest) compared with a national sample.

Methods: We used discrete-time survival models to estimate age-related risk for initiation with data from 2 population-based studies: the American Indian Service Utilization, Psychiatric Epidemiology, Risk and Protective Factors Project and the baseline National Comorbidity Survey.

Results: Among respondents who were born before 1960, peak risk for marijuana initiation in all samples was at age 18 years, and risk was greatest in the national sample. Among those who were born later than 1960, risk peaked at age 16 years and was highest in the American Indian samples. Males were at increased risk compared with females, especially in the older cohort and the Southwest tribal sample.

Conclusions: Findings of disproportionate risk for marijuana initiation among younger members of the tribal samples raise concerns that American Indian reservation youths may be increasingly vulnerable to drug use and its concomitants, which suggests a need for more aggressive prevention efforts in these communities.

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Figures

FIGURE 1—
FIGURE 1—
Marijuana initiation hazard curves for those born from 1944–1959 in the Northern Plains (NP) and Southwest (SW) tribes and a national sample: American Indian Service Utilization, Psychiatric Epidemiology, Risk and Protective Factors Project (AI-SUPERPFP), 1997–1999, and the National Comorbidity Survey (NCS), 1990–1992.
FIGURE 2—
FIGURE 2—
Marijuana initiation hazard curves for those born from 1960–1976 in the Northern Plains (NP) and Southwest tribes (SW) and a national sample: American Indian Service Utilization, Psychiatric Epidemiology, Risk and Protective Factors Project (AI-SUPERPFP), 1997–1999, and the National Comorbidity Survey (NCS), 1990–1992.
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