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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 4.

Linear Regression Analysis of Interference With Daytime Function (FSS-7 Scores, N=293)

Predictor R β
(full model)		 P-value
(full model)		 Δ in R2
Step 1: Demographics 0.058
 Female -0.073 -0.095 0.028
 Black race -0.240 -0.057 0.221
 Age (years) 0.014 0.030 0.462
Step 2: Clinical Characteristics 0.024
 CD4+ T-cell count -0.119 -0.098 0.016
 On ARV therapy 0.080 -0.023 0.584
 BMI (kg/m2) -0.081 0.001 0.983
Step 3: Other Symptoms 0.320
 Sleep disturbance (GSDS) 0.558 0.214 <0.001
 Depressive symptoms (CES-D) 0.451 0.129 0.028
 Anxiety (POMS) 0.325 -0.111 0.038
Step 4: Fatigue 0.031
 Morning fatigue (LFS) 0.452 0.012 0.832
 Evening fatigue (LFS) 0.391 0.140 0.011
Step 5: Energy 0.127
 Lack of energy score (MSAS) 0.687 0.477 <0.001
Full Model: F(12,280) = 29.6, P<0.001 0.560

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.