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Table 1 Clinical and epidemiological characteristics of 23 CFS women.

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

Characteristic

Number

Type of fatigue onset a

 

Gradual

12

Sudden

10

Age, years b

 

≤50

12

>50

11

Duration of illness b

 

≤10

15

>10

8

No. of CFS symptoms b

 

4

8

5

7

≥6

8

Body mass index c

 

Normal

6

Overweight

7

Obese

10

Illness group d

 

1

4

2

19

  1. a Onset type defined as sudden (self-reported as developing fatigue in = 1 week) or gradual (developing fatigue over a period = 1 month). One subject described onset as between 1 week and one month and was not classified for this stratification. b Further stratification and analysis using the Kruskal-Wallis nonparametric test did not show different results. c Analysis performed on BMI <25 (normal) compared with >30(obese). Subjects considered overweight were not included in this particular analysis. Further stratification and analysis using the Kruskal-Wallis test showed no significant differences between the groups (results not shown.). d Illness group defined by factor analysis of symptoms followed by cluster analysis [4].