Table 2.
Phi coefficients and z-tests for analysis of co-occurrence.
| Alcohol with Cigarettes | Alcohol with Cannabis | Cigarettes with Cannabis | ||||
|---|---|---|---|---|---|---|
| Phi (SE) | p | Phi (SE) | p | Phi (SE) | p | |
| Sex | ||||||
| Male | 0.429 (0.03) | < 0.001 | 0.457 (0.03) | < 0.001 | 0.568 (0.02) | < 0.001 |
| Female | 0.430 (0.02) | < 0.001 | 0.485 (0.02) | < 0.001 | 0.549 (0.02) | < 0.001 |
| Race/ethnicity | ||||||
| Black | 0.452 (0.03) | < 0.001 | 0.484 (0.03) | < 0.001 | 0.581 (0.03) | < 0.001 |
| Hispanic | 0.350 (0.03) | < 0.001 | 0.434 (0.03) | < 0.001 | 0.489 (0.03) | < 0.001 |
| White | 0.482 (0.03) | < 0.001 | 0.496 (0.03) | < 0.001 | 0.615 (0.03) | < 0.001 |
| Alcohol with Cigarettes | Alcohol with Cannabis | Cigarettes with Cannabis | ||||
| Z | p | Z | p | Z | p | |
| Male vs Female | −0.028 | 0.978 | −0.798 | 0.425 | 0.551 | 0.582 |
| Black vs White | −0.668 | 0.504 | −0.269 | 0.788 | −0.773 | 0.440 |
| Hispanic vs White | −2.981 | 0.003 | −1.405 | 0.106 | −2.895 | 0.004 |
| Black vs Hispanic | 2.466 | 0.014 | 1.214 | 0.225 | 2.279 | 0.023 |
Note: Phi coefficients and z-tests for analyses of co-occurrence of pairs of substances. Significance of the phi coefficients indicates whether the value differs significantly from zero. Significance of Z-tests indicate whether the phi coefficients of the two groups differ. Bolded z-test values indicate instances where the two groups differ significantly.