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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: J Pain Symptom Manage. 2012 Aug 20;45(2):191–201. doi: 10.1016/j.jpainsymman.2012.01.011

Table 3.

Linear Regression Analysis of MSAS Lack of Energy Composite Score (N=293)

Predictor R β
(full model)		 P-value
(full model)		 Δ in R2
Step 1: Demographics .088
 Female 0.015 0.113 0.109
 Black race -0.260 -0.117 0.043
 Female*Black race interaction -0.146 -0.148 0.058
 Age (years) 0.014 0.039 0.393
Step 2: Clinical Characteristics 0.025
 CD4+ T-cell count -0.066 -0.074 0.101
 On ARV therapy 0.127 0.097 0.037
 BMI (kg/m2) -0.074 -0.011 0.821
Step 3: Other Symptoms 0.320
 Sleep disturbance (GSDS) 0.574 0.360 <0.001
 Depressive symptoms (CES-D) 0.481 0.159 0.014
 Anxiety (POMS) 0.418 0.050 0.398
Step 4: Fatigue 0.016
 Morning fatigue (LFS) 0.466 0.138 0.035
 Evening fatigue (LFS) 0.346 0.023 0.711
Full Model: F(12,280) = 19.0, P < 0.001 0.449

Demographic and clinical characteristics were forced into the model for face validity and did not need to meet the criterion that r≥ 0.20 for inclusion in the model.