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Table 2 Pearson correlation coefficients (r) between HRV parameters (both time- and frequency-domains) and self-reported measures in the sample

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

 Mean RRSDRRRMSSDpNN50LFHFLF/HFHFnu
PSQI
 Sleep quality− .244*− .302*− .302*− .279*− .226− .275*.174− .203
 Sleep latency− .047− .190− .190− .161− .124− .170.188− .152
 Sleep duration− .223− .290*− .295*− .251*− .180− .320**.213− .216
 Habitual sleep efficiency− .182− .288*− .306*− .285*− .251*− .308*.284*− .249*
 Sleep disturbances− .301*− 286*− .323**− .291*− .226− .275*.303*− .283*
 Sleeping medication− .261*− .407**− .385**− .380**− .285*− .322**.130− .190
 Daytime dysfunction− .297*− .394**− .394**− .385**− .277*− .332**.367**− .403**
 Global score− .285*− .405**− .409**− .381**− .295*− .373**.302*− .312**
NCQ− .332**− .378**− .409**− .399**− .250*− .358**.341**− .409**
FIS-40
 Physical− .438**− .442**− .494**− .498**–.326**− .435**.309*− .423**
 Cognitive− .440**− .464**− .507**− .512**–.322**− .451**.360**− .476**
 Psychosocial− .439**− .462**− .501**− .502**–.337− .438**.324**− .431**
 Global score− .442**− .460**− .504**− .507**–.332− .443**.332**− .443**
HADS
 Anxiety− .334**− .347**− .379**− .377**− .273*− .339**.137− .283*
 Depression− .371**− .407**− .446**− .435**− .249*− .377**.308*− .449**
 Global score− .367**− .390**− .429**− .422**− .271*− .372**.236− .384**
COMPASS-31
 Orthostatic intolerance− .367**− .383**− .390**− .362**− .283*− .323**.276*− .314**
 Vasomotor− .293*− .155− .170− .194− .095− .092.060− .186
 Secretomotor− .330**− .379**− .395**− .396**− .291*− .319**.271*− .333**
 Gastrointestinal− .315**− .278*− .342**− .360**− .203− .251*.301*− .356**
 Bladder− .183− .181− .239− .229− .133− .225.219− .301*
 Pupillomotor− .322**− .319**− .347**− .353**− .189− 294*.192− .289*
 Global score− .368**− .359**− .400**− .397**− .261*− .317**.307*− .370**
  1. Significance: *p < 0.05; **p < 0.01