Table 4.

Post-hoc regression analyses accounting for the effects of adverse health symptoms (model 1) and concurrent GW exposures (in model 2) on the dependent variables.

	Dependent Variables
	Cortical GM	Frontal GM	Parietal GM	Occipital GM
Model 1
Step 1a
R2	0.735	0.726	0.684	0.543
F10,78	21.67g	20.16g	16.65g	8.21g
Step 2b
R2	0.760	0.759	0.694	0.610
ΔR2	0.025	0.033	0.010	0.066
ΔF7,71	1.06	1.34	0.33	1.50
Step 3c
R2	0.780	0.776	0.716	0.659
ΔR2	0.019	0.017	0.022	0.050
ΔF1,70	6.18e	5.08e	5.43e	8.93f
Model 2
Step 1a
R2	0.725	0.723	0.674	0.537
F10,69	18.17g	17.45g	14.09g	7.08g
Step 2d
R2	0.744	0.739	0.700	0.579
ΔR2	0.019	0.017	0.025	0.042
ΔF7,62	0.65	0.55	0.74	0.76
Step 3c
R2	0.768	0.753	0.734	0.657
ΔR2	0.025	0.013	0.034	0.078
ΔF1,61	6.51e	3.21	7.73f	12.12f

^aVariables entered: age, male sex, ICV, KS GWI case, predicted Khamisiyah exposure, diagnosis of current MDD and/or PTSD, current use of psychotropic medication, history of alcohol and/or substance abuse/dependence.

^bVariables entered: KS GWI exclusionary criteria, fatigue, pain, neurological, mood, cognitive, skin, gastrointestinal, and respiratory symptom severity scores.

^cVariable entered: Frequency of hearing chemical alarm.

^dVariables entered: seeing smoke from oil well fires, living area being fogged or sprayed with pesticides; being within one mile of SCUD missile explosion; coming into direct contact with destroyed enemy vehicles; using pesticide cream or liquid on skin; wearing pesticide-treated uniform; living/sleeping in tent heated by a fuel-burning heater.

^ep < 0.05.

^fp < 0.01.

^gp < 0.001.