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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Drug Alcohol Depend. 2013 Nov 25;135:88–94. doi: 10.1016/j.drugalcdep.2013.11.013

Table 3.

Multiple regressions examining symptoms of inattention (IN) and hyperactivity/impulsivity (HI) in predicting substance use outcomes

Multiple Regressions testing current symptoms
N IN HI IN x HI Interaction Model
B 95% CI B 95% CI B 95% CI R2 F
Substance Use Measure
Cannabis Dependence 376 .35** [.18, .52] −.09 [−.25, .07] −.14 [−.31, .02] .13 8.8**
Age of initiation1 244 −.61 [−1.7, .51] −.17 [−1.3, 1.0] .45 [−.61, 1.5] .02 .65
Craving for cannabis 376 .14* [.06, .22] −.06 [−.13, .02] −.03 [−.11, .05] .12 8.4**
Problems related to cannabis use 376 .10** [.06, .15] −.03 [−.07, .01] −.04 [−.08, .00] .19 14.4**
Current cannabis use 376 .64** [.32, .96] −.03 [−.32, .26] −.28 [−.59, .03] .10 6.8**
Current alcohol use 376 .80** [.44, .1.2] .16 [−.17, .49] −.48 [−.83,−.14] .15 10.5**
Current cigarette use 376 .49* [.15, .82] −.10 [−.40, .21] −.06 [−.38,.26] .08 5.3**
Multiple Regressions testing childhood symptoms
N IN HI IN x HI Interaction Model
B 95% CI B 95% CI B 95% CI R2 F
Cannabis Dependence 376 .12 [−.02, .25] .07 [−.04, .17] −.05 [−.14, .05] .03 2.9+
Age of initiation1 244 .22 [.55, 1.0] −.97* [−1.7, .28] .40 [−.16, .96] .04 2.5+
Craving for cannabis 376 .08* [.02,.15] .04 [−.01, .09] −.05+ [−.09, .00] .03 2.8+
Problems related to cannabis use 376 .07* [.02, .12] .02 [−.01, .04] −.03* [−.05, −.01] .05 4.6**
Current cannabis use 376 .47* [.12, .82] .10 [−.05, .24] −.23* [−.40,−.05] .03 3.0+
Current alcohol use 376 .35* [.08, .63] .30* [.08, .51] −.19 [−.39,.01] .07 6.4**
Current cigarette use 376 .22 [−.03, .48] .17 [−.03, .37] −.17+ [−.35,.01] .02 1.6

Note. IN=Inattention; HI=Hyperactivity-Impulsivity. Gender and comorbid internalizing and (non-substance use related) externalizing symptom counts were included as covariates in all models testing current symptoms. Gender only included as a covariate in all models testing childhood symptoms.

+

Trend level p<.05;

*

p< 0.01 level (2-tailed);

**

p< 0.001 (2-tailed).

1

Associations with age of initiation were tested in the smaller sample of users only.