. Author manuscript; available in PMC: 2017 Mar 1.

Published in final edited form as: Am J Drug Alcohol Abuse. 2016 Feb 2;42(2):231–241. doi: 10.3109/00952990.2015.1121269

Table 4.

Hierarchical multiple linear regressions examining the effects of drug user type, ADHD symptoms, and “cool” neurocognitive impulsivity on sexual risk behavior.

	Past 30-day Sexual Risk Behaviors		Past 6-month Sexual Risk Behaviors		Lifetime Sexual Risk Behaviors
	ΔR²	β	ΔR²	β	ΔR²	β

Step 1: Control Variables	.02		.03		.14^**
Step 2: Drug User Groups	.01		.03		.11^**
Amphetamine		.05		.12		.25^**
Heroin		.14		.17		.31^**
Polysubstance		.06		.20^*		.34^**
Step 3: Main Effects of ADHD and “Cool” Impulsivity	.01		.01		.01
WURS		−.01		.06		.09
“Cool” Impulsivity		.08		.05		−.04
Step 4: Drug User Group Interactions with ADHD and “Cool” Impulsivity Composite	.03		.05		.02
Amphetamine × WURS		−.14		.07		−.04
Amphetamine × “Cool” Impulsivity		.04		.15		.10
Heroin × WURS		−.18		−.22		.24
Heroin × “Cool” Impulsivity		−.02		.08		−.08
Polysubstance × WURS		−.43		−.39		.002
Polysubstance × “Cool” Impulsivity		−.09^*		−.01		−.01

Note.

p < .05;

^**

p < .01;

WURS = Wender Utah Rating Scale total score