Table 1.

Parameter Estimates and Standard Errors Predicting Age of Onset of Alcohol Use

	Boys			Girls
Predictor variables	Parameter	SE	ORa	Parameter	SE	ORa
Age 3–14
Parental alcoholism	0.73**	0.26	2.08	1.31**	0.49	3.69
Sleep problems	0.54**	0.20	1.72	−0.59	0.41	--
Age 15–17
Parental alcoholism	1.09**	0.43	2.98	−0.08	0.87	--
Sleep problems	−0.94	0.55	--	1.69*	0.83	5.42
Age 3–14
Parental alcoholism	0.79*	0.27	2.19	0.99	0.53	--
Sleep problems	0.64*	0.26	1.90	−0.44	0.45	--
Age 15–17
Parental alcoholism	1.18**	0.45	3.28	−0.40	0.89	--
Sleep problems	−0.90	0.57	--	1.75*	0.86	5.75
Externalizing prob. intercept	0.03	0.02	--	0.03	0.02	--
Externalizing prob. slope	0.89**	0.34	2.44	0.89**	0.34	2.44
Age 3–14
Parental alcoholism	0.73**	0.26	2.08	1.11*	0.52	3.04
Sleep problems	0.56*	0.24	1.75	−0.42	0.44	--
Age 15–17
Parental alcoholism	1.01**	0.43	3.00	−0.30	0.89	--
Sleep problems	−0.92	0.56	--	1.84*	0.85	6.30
Internalizing prob. interceptb	--	--	--	--	--	--
Internalizing prob. slope	0.11	0.81	--	0.87	0.75	--

Note. Three sets of results were presented here. The first model estimated how onset of alcohol use was predicted by parental alcoholism and sleep problems. The second model added externalizing problems as a predictor. The third model used internalizing problems instead of externalizing problems as the additional predictor.

^aEstimated odds of event occurrence when the respective explanatory variable increased by one unit. Estimated odds were calculated only when the variable was statistically significant.

^bInternalizing problems intercept was dropped from the analyses because (i) it has no significant relationship with onset of marijuana use and (ii) including it in the analyses led to non-convergence of model.

^*p < 0.05,

^**p < 0.01.