Table 3.

Effects of Self−reported Impulsivity Subtraits, Sex, and their Interaction on Age at First Methamphetamine Use

Coefficientsa
Model		Unstandardized Coefficients		Standardized Coefficients	t	Sig.	95.0% Confidence Interval for B		Correlations
		B	Std. Error	Beta			Lower Bound	Upper Bound	Zero- order	Partial	Part
1	(Constant)	22.682	.550		41.246	.000	21.595	23.768
	Centered_YearsMAUse	−.394	.064	−.442	−6.129	.000	−.521	−.267	−.442	−.442	−.442
2	(Constant)	22.764	.634		35.930	.000	21.512	24.016
	Centered_YearsMAUse	−.371	.068	−.416	−5.482	.000	−.505	−.237	−.442	−.411	−.384
	Sex	−.406	1.230	−.024	−.330	.742	−2.837	2.025	−.071	−.027	−.023
	Centered_BIS_Attention	−.237	.185	−.144	−1.283	.201	−.602	.128	−.311	−.105	−.090
	Centered_BIS_Attention_Sex	−.240	.374	−.073	−.641	.522	−.979	.499	−.126	−.053	−.045
	Centered_BIS_Motor	−.325	.161	−.232	−2.010	.046	−.644	−.006	−.298	−.163	−.141
	Centered_BIS_Motor_Sex	.149	.265	.060	.564	.574	−.374	.673	−.077	.046	.039
	Centered_BIS_Nonplanning	.171	.137	.126	1.248	.214	−.100	.443	−.206	.102	.087
	Centered_BIS_Nonplanning_Sex	.194	.317	.066	.614	.540	−.431	.820	−.068	.050	.043

^aDependent Variable: Age of first meth use