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Table 4 Correlation* between changes (first to second visit) of selected variables

From: Adolescent chronic fatigue syndrome; a follow-up study displays concurrent improvement of circulatory abnormalities and clinical symptoms

 

Change in Fatigue severity score†

Change in Autonomic

scorea

 

t

p-value §

t

p-value §

Change in Fatigue severity score†

n.a

n.a

0.27

0.044

Change in Functional impairment scoreb

0.36

0.003

0.14

0.291

  1. * Kendall rank correlation. § Kendall's tau test, 2-sided. † The average of 7 items, each having a 1-5 Likert scale. a The sum of 22 dichotomized items addressing different autonomic symptoms; total range is from 0 to 22. b The average of 3 items, each having a 1-5 Likert scale. τ = tau (correlation coefficient)