. Author manuscript; available in PMC: 2016 Sep 1.

Published in final edited form as: Clin Psychol Sci. 2014 Nov 26;3(5):663–674. doi: 10.1177/2167702614551766

Table 4.

Hierarchical Multiple Regression Analyses Predicting PTSD Symptoms During Deployment, at Return and Three Months After Return

	Measurement Times During and after Deployment
	During		Return		Return +3 mo.

Entire scales	ΔR²	β	ΔR²	β	ΔR²	β
Step 1	.50^***		.28^***		.21^***
PCL Before		.66^***		.46^***		.45^***
Combat exposure¹		.18^**		.22^**		.06
Step 2	.02^*		.07^***		.05^***
PCL Before		.50^***		.11		.15
Combat exposure		.16^**		.20^**		.01
PreCL Before		.20^*		.44^***		.38^***
Total R ²	.52^***		.35^***		.26^***
N	193		197		203

Sums for items 1 to 8	ΔR²	β	ΔR²	β	ΔR²	β

Step 1	.34^***		.14^***		.18^***
PCL Before		.52^***		.26^***		.41^***
Combat exposure		.22^***		.24^**		.07
Step 2	.04^***		.08^***		.10^***
PCL Before		.38^***		.07		.20^**
Combat exposure		.19^**		.22^**		.01
PreCL Before		.25^***		.34^***		.39^***
Total R ²	.38^***		.22^***		.28^***
N	193		197		203

Note:

p<.05,

^**

p<.01,

^***

p<.0001;

Combat exposure is always measured concurrently with the dependent variable. Items 1 to 8 are temporally reversed in PreCL.