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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Drug Alcohol Depend. 2012 Jul 17;127(0):129–136. doi: 10.1016/j.drugalcdep.2012.06.022

Table 2.

Hierarchical Regression Analyses Examining Number of Depression and PTSD Symptoms Predicting Alcohol Demand (Intensity, Breakpoint, Omax, Pmax, & Elasticity)†

Reinforcing Efficacy Indices
Intensity
 Breakpoint
 Omax
 Pmax
 Elasticity
Predictor ΔR2 β ΔR2 β ΔR2 β ΔR2 β ΔR2 β
Depression Symptoms
Step 1 .31*** .12** .29*** .07* .17***
Drinks Per
      Week		 .48*** .29** .60*** .08 −.44***
    Gender −.08 .25* .12 .14 −.21*
  Ethnicity −.12 .26** .08 .23* −.14
Step 2 .05** .01 .02 .01 .04*
Depression .24** .08 .14 .09 −.21*
Symptoms
Total R2 .36** .13 .30 .08 .21*
N 128 128 128 126 96
PTSD Symptoms
Step 1 .39*** .14** .35*** .06 .14*
Drinks Per
      Week		 .55*** .36** .63*** .11 −.37*
    Gender −.11 .23* .04 .14 −.14
  Ethnicity .05 .25* .09 .14 .00
Step 2 .04** .04* .06** .07** .05*
    PTSD
symptoms		 .22** .21* .25** .28** −.24*
Total R2 .43** .17* .40** .13** .19*
n 88 88 88 87 67
†

Forty participants had missing elasticity data due to poor curve fit.

*

p ≤ .05.

**

p ≤ .01.

***

p ≤ .001.