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Table 2 Identification of differentially expressed genes in CFS subjects by clinical or epidemiologic variables.

From: Integration of gene expression, clinical, and epidemiologic data to characterize Chronic Fatigue Syndrome

Clinical or epidemiologic variable SAMa t-Testb (unequal variance) Wilcoxonb
Type of fatigue onset (gradual or sudden) 117 199 159
Illness group (1 or 2) 0 15 1
Age (≤50 or >50 years) 4 29 22
Body mass index (<25 or >30) 0 4 5
No. of symptoms (4 or ≥6) 0 0 0
Duration of illness (≤10 or >10) 6 19 10
  1. a Number of genes for which false discovery rate (FDR) = 5% b Number of genes for which comparison yielded p < 0.01 c The 7 subjects with 5 symptoms (Table 1) were excluded from the analysis of data shown in Table 2. Analysis including these subjects into either group did not significantly affect the outcome.