Table 2.

Contrasts between Four Waves by Conditions

	Parent-Youth (PY)		Parent-Only (PO)		Comparison (C)
	Contrast	95% C.I.	Contrast	95% C.I.	Contrast	95% C.I.
Outcome: Any substance
1 vs 2	0.009	[−0.051; 0.070]	0.072	[0.017; 0.127]	0.039	[−0.019; 0.098]
1 vs 3	0.054	[−0.006; 0.114]	0.033	[−0.015; 0.081]	0.043	[−0.020; 0.106]
1 vs 4	0.044	[−0.019; 0.107]	0.006	[−0.047; 0.059]	0.097	[0.017; 0.176]
2 vs 3	0.045	[−0.021; 0.111]	−0.039	[−0.091; 0.012]	0.004	[−0.061; 0.068]
2 vs 4	0.034	[−0.032; 0.101]	−0.066	[−0.129; −0.003]	0.057	[−0.024; 0.138]
3 vs 4	−0.010	[−0.072; 0.052]	−0.027	[−0.082; 0.028]	0.054	[−0.016; 0.123]
Outcome: Alcohol
1 vs 2	0.008	[−0.034; 0.050]	0.023	[−0.015; 0.061]	0.044	[−0.009; 0.097]
1 vs 3	0.053	[0.000; 0.106]	0.025	[−0.012; 0.062]	0.027	[−0.019; 0.074]
1 vs 4	0.055	[−0.001; 0.111]	−0.006	[−0.046; 0.035]	0.076	[0.011; 0.141]
2 vs 3	0.045	[−0.011; 0.100]	0.002	[−0.040; 0.044]	−0.017	[−0.067; 0.034]
2 vs 4	0.047	[−0.012; 0.106]	−0.029	[−0.070; 0.013]	0.032	[−0.035; 0.099]
3 vs 4	0.002	[−0.051; 0.055]	−0.031	[−0.073; 0.011]	0.049	[−0.006; 0.103]
Outcome: Inhalant
1 vs 2	−0.039	[−0.091; 0.013]	0.042	[−0.015; 0.098]	0.007	[−0.033; 0.047]
1 vs 3	0.003	[−0.047; 0.052]	0.013	[−0.035; 0.060]	−0.001	[−0.047; 0.045]
1 vs 4	−0.015	[−0.063; 0.033]	−0.021	[−0.067; 0.026]	−0.027	[−0.071; 0.017]
2 vs 3	0.042	[−0.011; 0.094]	−0.029	[−0.072; 0.015]	−0.008	[−0.052; 0.036]
2 vs 4	0.024	[−0.027; 0.075]	−0.062	[−0.116; −0.009]	−0.034	[−0.077; 0.010]
3 vs 4	−0.018	[−0.060; 0.024]	−0.034	[−0.075; 0.007]	−0.026	[−0.066; 0.014]
Outcome: Cigarette
1 vs 2	−0.033	[−0.076; 0.009]	−0.003	[−0.037; 0.031]	0.020	[−0.017; 0.057]
1 vs 3	−0.011	[−0.047; 0.025]	−0.016	[−0.040; 0.009]	−0.006	[−0.034; 0.021]
1 vs 4	0.005	[−0.032; 0.041]	−0.013	[−0.053; 0.026]	−0.002	[−0.033; 0.028]
2 vs 3	0.023	[−0.010; 0.055]	−0.012	[−0.048; 0.023]	−0.027	[−0.064; 0.011]
2 vs 4	0.038	[−0.013; 0.089]	−0.010	[−0.045; 0.024]	−0.022	[−0.063; 0.018]
3 vs 4	0.016	[−0.028; 0.059]	0.002	[−0.032; 0.037]	0.004	[−0.024; 0.032]
Outcome: Marijuana
1 vs 2	−0.010	[−0.051; 0.030]	0.048	[−0.003; 0.099]	0.021	[−0.016; 0.059]
1 vs 3	0.025	[−0.017; 0.068]	0.002	[−0.025; 0.029]	0.026	[−0.021; 0.073]
1 vs 4	0.027	[−0.020; 0.075]	−0.001	[−0.049; 0.047]	0.061	[−0.002; 0.125]
2 vs 3	0.035	[−0.014; 0.085]	−0.046	[−0.098; 0.005]	0.005	[−0.043; 0.053]
2 vs 4	0.038	[−0.020; 0.095]	−0.049	[−0.108; 0.010]	0.040	[−0.027; 0.107]
3 vs 4	0.002	[−0.050; 0.054]	−0.003	[−0.045; 0.039]	0.035	[−0.022; 0.091]

Note: Bold if significant at the .05 level of significance; underlined if significant at the .10 level of significance; a hypothetical 13-year old US-born male student who participated in the 2014 intervention with the average grade B; all contrasts are based on the GEE results by using mi estimate and mimrgns commands in Stata 14.2.