Table 4.
Estimates for models testing mediation by change in depressive symptoms and change in peer heavy drinking and peer marijuana use
| Effect | Depression Coeff. (SE) | Peer heavy drinking Coeff. (SE) | Peer marijuana use Coeff. (SE) | Heavy drinking Coeff. (SE) | Marijuana use Coeff. (SE) | Cigarette smoking |
| Intercept | 3.52** (0.07) | −0.03 (0.02) | −0.03 (0.02) | −2.75** (0.09) | −3.38** (0.12) | −3.02** (0.13) |
| Male | −0.64** (0.12) | 0.03 (0.04) | 0.10** (0.03) | 0.09 (0.09) | 1.67** (0.09) | 0.37** (0.11) |
| T1 controla | 0.57** (0.03) | 0.37** (0.02) | 0.46** (0.02) | 0.84** (0.05) | 1.68** (0.09) | 3.00** (0.12) |
| Started relationship | 0.00 (0.20) | 0.06 (0.05) | 0.01 (0.06) | 0.08 (0.14) | 0.08 (0.17) | 0.35* (0.18) |
| More committed | 0.52 (0.34) | 0.05 (0.09) | −0.04 (0.09) | 0.19 (0.21) | 0.19 (0.25) | 0.17 (0.27) |
| Ended relationship | 0.68** (0.23) | 0.18** (0.06) | 0.18** (0.06) | 0.60** (0.14) | 0.51** (0.17) | 0.55** (0.19) |
| Less committed | −0.05 (0.46) | 0.04 (0.11) | 0.16 (0.10) | −0.22 (0.26) | 0.35 (0.35) | 0.49 (0.34) |
| Switched partners | 0.30 (0.35) | 0.28** (0.11) | 0.45** (0.12) | 0.32 (0.25) | 0.57 (0.30) | 0.76* (0.30) |
| Prior depression | 0.01 (0.01) | 0.03* (0.02) | 0.05** (0.01) | |||
| Change in depression | 0.00 (0.01) | 0.04* (0.02) | 0.06** (0.02) | |||
| Prior peer use | 1.05** (0.06) | 1.19** (0.08) | – | |||
| Change in peer use | 0.71** (0.06) | 1.05** (0.06) | – |
Notes: Coeff. = coefficient. n = 2,563 intervals for 939 individuals.
a
The dependent variable for the given model measured at the prior to the 6-month interval.
*
p < .05;
**
p < .01.