Table 3.

Estimates for models of the associations between relationship status transitions and change in substance use

Effect	Heavy drinking Coefficient (SE)	Marijuana use Coefficient (SE)	Cigarette smoking Coefficient (SE)
Models for cases with shared status at T1
Single at T1a
Intercept	−2.41** (0.11)	−2.94** (0.14)	−3.33* (0.19)
Male	0.18 (0.12)	0.39** (0.15)	0.49** (0.16)
T1 use	1.14** (0.07)	2.31* (0.13)	3.18** (0.17)
To dating	0.17 (0.15)	−0.04 (0.19)	0.45* (0.19)
To cohabiting	0.03 (0.34)	0.29 (0.37)	0.16 (0.59)
Dating at T1b
Intercept	−2.47** (0.13)	−3.12** (0.17)	−3.24 (0.22)
Male	−0.06 (0.13)	−0.02 (0.17)	0.07 (0.17)
T1use	1.10** (0.07)	2.06** (0.14)	2.94** (0.20)
To single	0.50** (0.16)	0.84** (0.19)	0.68** (0.22)
To cohabiting	0.24 (0.22)	0.22 (0.25)	0.21 (0.29)
Dating new partner	0.29 (0.31)	0.83* (0.37)	0.35 (0.41)
Cohabiting at T1c
Intercept	−3.45** (0.33)	−2.81** (0.32)	−1.59** (0.27)
Male	−0.17 (0.29)	−0.05 (0.31)	0.27 (0.34)
T1 use	1.15** (0.15)	2.33** (0.26)	2.84** (0.28)
To single	1.78** (0.43)	0.99* (0.48)	0.21 (0.70)
To dating	−0.10 (0.34)	0.30 (0.31)	0.14 (0.37)
Combined modelsd
Intercept	−2.21** (0.08)	−2.97** (0.11)	−3.01** (0.13)
Male	0.05 (0.08)	0.22* (0.09)	0.30** (0.10)
T1 use	1.11** (0.05)	2.22** (0.10)	3.00** (0.12)
Started relationship	0.16 (0.13)	0.07 (0.16)	0.38* (0.18)
More committed	0.22 (0.19)	0.01 (0.24)	0.15 (0.26)
Ended relationship	0.66** (0.13)	0.71** (0.16)	0.56** (0.19)
Less committed	-0.33 (0.29)	0.41 (0.25)	0.53 (0.34)
Switched partners	0.45 (0.25)	1.06** (0.30)	0.77* (0.30)

Notes: T1: Prior to interval.

^an = 1,277 intervals for 615 individuals;

^bn = 894 intervals for 517 individuals;

^cn = 279 intervals for 188 individuals;

^dn = 2,563 intervals for 939 individuals.

^*p < .05;

^**p < .01.