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Table 1 Defining variables used in the Wichita and Georgia studies

From: Replication of an empirical approach to delineate the heterogeneity of chronic unexplained fatigue

Wichita Georgia
Unrefreshing sleep Unrefreshing sleep
Sleep problems Sleep problems
Post-exertional fatigue Post-exertional fatigue
Muscle pain Muscle pain
Joint pain Joint pain
Severe headache Headache
Concentration Concentration
Photophobia Photophobia
Sore throat Sore throat
Shortness of breath Shortness of breath
Stomach or abdominal pain Stomach or abdominal pain
Fever Fever
Nausea Nausea
Depression (Zung score) Depression (Zung score)
Sleepiness (Epworth score) Sleepiness (Epworth score)
Sleep resp. disturbance index  
Sleep-total time  
Sleep-total arousals  
Sleep-HR variability Heart rate at rest
Sleep REM latency  
Age Age
Body mass index Body mass index
Neck circumference Neck circumference
High sensitivity CRP High sensitivity CRP
Serum insulin Serum insulin
Free T3  
Free testosterone  
24 hours Urinary free cortisol Cortisol index
Hemoglobin Hemoglobin
Bilirubin Bilirubin
Tilt BP_5min_stand_index Systolic blood pressure