Table 5.

Conditional Linear Growth Analysis (LGA), Marijuana Use

		Marijuana use
		Estimate (S.E.)	95% CI
Means
	Intercept	−1.425 (1.409)	[−4.187, 1.337]
	Slope	−0.185 (0.490)	[−1.146, 0.776]
Variances
	Intercept	8.222 (1.264)***	[5.746, 10.699]
	Slope	0.657 (0.106)***	[0.449, 0.866]
Covariates predicting the intercept
	Sex	0.146 (0.440)	[−0.716, 1.008]
	Mother education	−0.392 (0.253)	[−0.888, 0.104]
	Household income	−0.404 (0.312)	[−1.016, 0.209]
Covariates predicting the slope
	Sex	0.022 (0.154)	[−0.279, 0.324]
	Mother education	0.139 (0.093)	[−0.044, 0.321]
	Household income	−0.015 (0.120)	[−0.249, 0.220]
Time-varying covariates (concurrent)
	Marijuana use 13 <– e-cig 13	−1.033 (0.131)***	[−1.290, −0.776]
	Marijuana use 13.5 <– e-cig 13.5	1.016 (0.397)*	[0.238, 1.794]
	Marijuana use 14 <– e-cig 14	0.701 (0.124)***	[0.459, 0.943]
	Marijuana use 14.5 <– e-cig 14.5	0.507 (0.090)***	[0.330, 0.684]
	Marijuana use 15 <– e-cig 15	0.440 (0.078)***	[0.287, 0.594]
	Marijuana use 15.5 <– e-cig 15.5	0.374 (0.041)***	[0.293, 0.454]
	Marijuana use 16 <– e-cig 16	0.424 (0.047)***	[0.332, 0.516]
	Marijuana use 16.5 <– e-cig 16.5	0.064 (0.079)	[−0.091, 0.219]
	Marijuana use 17 <– e-cig 17	0.012 (0.063)	[−0.111, 0.135]
	Marijuana use 17.5 <– e-cig 17.5	0.192 (0.086)*	[0.023, 0.361]
Time-varying covariates (lagged)
	Marijuana use 13 <–	--	--
	Marijuana use 13.5 <– e-cig 13	−0.437 (0.100)***	[−0.633, −0.241]
	Marijuana use 14 <– e-cig 13.5	−0.059 (0.462)	[−0.964, 0.846]
	Marijuana use 14.5 <– e-cig 14	0.141 (0.084)	[−0.024, 0.306]
	Marijuana use 15 <– e-cig 14.5	0.137 (0.093)	[−0.046, 0.319]
	Marijuana use 15.5 <– e-cig 15	0.210 (0.050)***	[0.112, 0.308]
	Marijuana use 16 <– e-cig 15.5	0.053 (0.044)	[−0.033, 0.139]
	Marijuana use 16.5 <– e-cig 16	0.357 (0.081)***	[0.199, 0.515]
	Marijuana use 17 <– e-cig 16.5	0.316 (0.083)***	[0.153, 0.479]
	Marijuana use 17.5 <– e-cig 17	−0.030 (0.121)	[−0.267, 0.207]

Note.

^***p < .001;

^**p < .01;

^*p < .05.