Table 4d.

Linear Regression Statistics: Age of Onset of Regular Alcohol Use^a (N = 144)

Predictor	ΔR2	p	Model F (df)	p	Standardized β	Bootstrapped p
Step 1. Gender	0.001	.700	0.149 (1, 142)	.700	−0.032	.876
Step 2. Stim	0.049	.020	2.860 (2, 141)	.062	−0.209	.158
Step 3. NEM	0.009	.323	2.235 (3, 140)	.088	−0.096	.421
Step 4. Stim × NEM	0.000	.890	1.666 (4, 139)	.163	−0.015	.876
Final R2	0.050

Note. Stim = change score on the Stimulant scale of the Biphasic Alcohol Effects Scale (1.5 h – baseline); NEM = Negative Emotionality, higher-order factor scale on the Multidimensional Personality Questionnaire.

^aAt least once a month