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Table 3 Pearson correlations between measures assessed in the sample

From: Reduced heart rate variability predicts fatigue severity in individuals with chronic fatigue syndrome/myalgic encephalomyelitis

Measures NCQ FIS-40 HADS COMPASS-31
PSQI .824** .813** .729** .816**
NCQ   .942** .796** .852**
FIS-40    .843** .839**
HADS     .796**
  1. Significance: **p < 0.001