Adjusted odds of past-year marijuana use in adults in the USA, NHANES 2005–2018
| Demographic variable | Past-year marijuana use OR (95% CI) | P value |
| Age of participants | ||
| 18–29 | 1.0 (reference) | |
| 30–49 | 0.39 (0.36 to 0.43) | <0.001 |
| 50–69 | 0.26 (0.22 to 0.30) | <0.001 |
| Gender | ||
| Female | 1.0 (reference) | |
| Male | 1.67 (1.55 to 1.81) | <0.001 |
| Race | ||
| Non-Hispanic white | 1.0 (reference) | |
| Non-Hispanic black | 1.23 (1.09 to 1.39) | 0.001 |
| Hispanic/Mexican | 0.51 (0.44 to 0.58) | <0.001 |
| Other | 0.63 (0.54 to 0.73) | <0.001 |
| Education | ||
| <High school | 1.0 (reference) | |
| High school | 0.95 (0.81 to 1.12) | 0.58 |
| >High school | 0.82 (0.73 to 0.93) | 0.003 |
| Poverty | ||
| >2x poverty level | 1.0 (reference) | |
| 1–2x poverty level | 1.41 (1.24 to 1.59) | <0.001 |
| <Poverty level | 1.69 (1.49 to 1.92) | <0.001 |
| Year of survey | 1.10 (1.05 to 1.14) | <0.001 |
OR with 95% CIs computed using 12-year interview weights to provide estimates for the total US population and are age standardised to the US 2000 Census population.
Poverty defined using poverty income ratio, which accounts for family size.
Year covariate modelled as a continuous variable.
NHANES, National Health and Nutrition Examination Survey.