Table 4.
Multilevel linear predicting poor general health.
| Fixed effects | All months (n = 14,528 person months among 767 individuals) | Alcohol-use months (n = 11,229 person months among 748 individuals) | Months in which both alcohol and marijuana used (n = 4,268 person months among 534 individuals) | |||
|---|---|---|---|---|---|---|
|
| ||||||
| B | 95% CI | B | 95% CI | B | 95% CI | |
| Between person | ||||||
| Intercept | 1.22 | (1.02,1.42) | 1.41 | (1.18,1.64) | 1.06 | (0.87,1.25) |
| Female | 0.32 | (0.22,0.42) | 0.28 | (0.17,0.39) | 0.29 | (0.15,0.43) |
| Race/ethnicity | ||||||
| Non-Hispanic White (reference) | ||||||
| Non-Hispanic Asian | 0.03 | (−0.11,0.17) | 0.02 | (−0.13,0.16) | 0.02 | (−0.20,0.24) |
| Non-Hispanic Other | 0.06 | (−0.08,0.20) | 0.05 | (−0.09,0.20) | 0.19 | (0.01,0.38) |
| Hispanic | 0.08 | (−0.10,0.25) | 0.07 | (−0.10,0.24) | 0.17 | (−0.04,0.37) |
| Age in years | 0.01 | (−0.02,0.04) | 0.01 | (−0.03,0.04) | −0.01 | (−0.05,0.03) |
| Proportion of all months | ||||||
| Alcohol use | −0.28 | (−0.53,−0.02) | ||||
| Both alcohol and marijuana use | 0.01 | (−0.28,0.29) | ||||
| Person average substance use | ||||||
| Alcohol use quantity/frequency | 0.00 | (−0.09,0.10) | 0.00 | (−0.11,0.10) | ||
| Marijuana use occasions | 0.08 | (0.01,0.14) | ||||
| Proportion of all months | ||||||
| Neither alcohol nor marijuana | ref. | ref. | ||||
| Alcohol-only | −0.09 | (−0.32,0.15) | ||||
| Marijuana-only | 0.42 | (−0.18,1.02) | ||||
| CAM | 0.08 | (−0.26,0.42) | ||||
| SAM | 0.31 | (0.06,0.56) | ||||
| Proportion of alcohol-use months | ||||||
| Alcohol-only | ref. | ref. | ||||
| CAM | 0.30 | (0.04,0.56) | ||||
| SAM | 0.37 | (0.18,0.55) | ||||
| Proportion of alcohol and marijuana months | ||||||
| CAM | ref. | ref. | ||||
| SAM | 0.02 | (−0.22,0.26) | ||||
| Within-person (time-varying) | ||||||
| Month of study (in years) | 0.08 | (0.04,0.11) | 0.09 | (0.05,0.13) | 0.11 | (0.05,0.17) |
| Quantity/frequency of alcohol use | 0.03 | (0.00,0.06) | 0.03 | (−0.02,0.08) | ||
| Marijuana use occasions | 0.00 | (−0.03,0.03) | ||||
| Pattern of substance use | ||||||
| Neither alcohol nor marijuana | ref. | ref. | ||||
| Alcohol-only | 0.03 | (−0.03,0.08) | ref. | ref. | ||
| Marijuana-only | 0.08 | (−0.02,0.17) | ||||
| CAM | 0.00 | (−0.07,0.08) | −0.04 | (−0.10,0.02) | ref. | ref. |
| SAM | 0.01 | (−0.06,0.09) | −0.03 | (−0.09,0.03) | 0.02 | (−0.04,0.09) |
| Random effects | ||||||
|
| ||||||
| Intercept variance | 0.44 | 0.43 | 0.43 | |||
| Within-person variance | 0.56 | 0.56 | 0.54 | |||
Note. SAM=simultaneous alcohol and marijuana; CAM=concurrent alcohol and marijuana but not simultaneous use. Bold typeface indicates p<.05