Table 1.
Key mediation model regression coefficients for models examining driving after marijuana use (DMU) and driving after 5+ drinking (D5D)
| Coefficient | Association | Interpretation |
|---|---|---|
| ad | X→M | Direct association between within-person change in the specified social rolea (X) and within-person change in the specified mediatorb (M) at any specific wave, controlling for within-person change in other social roles, age, and all between-person differences. Associations should be the same (or very close to the same) for each social role/mediator pair when comparing DMU and D5D. For example, the direct association between living with parents and evenings out should not vary substantially between DMU and D5D models. |
| be | M→Y | Direct association between within-person change in the specified mediator (M) and the likelihood of the specified driving outcomec (Y) at any specific wave, controlling for within-person change in the specified social role (X), within-person change in other social roles, age, and all between-person differences. Associations should be the same (or very close to the same) for all b estimates within each driving outcome. For example, the direct association between evenings out and DMU should not vary substantially between models testing different social role/evenings out mediation associations with DMU. |
| c'e | X→Y | Direct association between within-person change in the specified social role (X) and the likelihood of the specified driving outcome (Y) at any specific wave, controlling for within-person change in the specified mediator (M), within-person change in other social roles, age, and all between-person differences. |
| a*be | X→M→Y | Association sequence from within-person change in the specified social role (X) through within-person change in the specified mediator (M) to the likelihood of the specified driving outcome (Y) at any specific wave, controlling for within-person change in other social roles, age, and all between-person differences: |
| Mediation association: If there is a significant total association between within-person change in the specified social role (X) and the likelihood of the specified driving outcome (Y) at any specific wave, within-person change in the specified mediator (M) transmits at least part of the significant association. | ||
| Indirect association: If there is no significant total association between within-person change in the specified social role (X) and the likelihood of the specified driving outcome (Y) at any specific wave, within-person change in the specified social role is indirectly associated with the likelihood of the specified driving outcome (Y) by being significantly associated with within-person change in the specified mediator (M), which then is significantly associated with the likelihood of the specific driving outcome (Y) at any specific wave. |
Notes:
a
Either living with parents, marriage, parenthood, college attendance, or employment;
b
either perceived risk (of regular marijuana use if the outcome is driving after marijuana use, or perceived risk of 5+ drinking if the outcome is driving after 5+ drinking), evenings out, or religiosity;
c
either any driving after marijuana use, or any driving after 5+ drinking;
d
expressed as nonstandardized multivariable regression coefficients;
e
expressed as adjusted odds ratios of the multivariable likelihood of reporting any driving (either driving after marijuana use, or driving after 5+ drinking).