title: A factor analysis of chronic fatigue symptoms in a community-based sample.
abstract: BACKGROUND
  This study examined characteristics of fatigue in individuals with chronic fatigue from a community-based study. Most studies of chronic fatigue have been based on patients recruited from primary or tertiary care settings. Samples such as these might not be representative of patients within the general population. The purpose of this study was to determine the factor structure of participants' symptoms in a random community sample of individuals with chronic fatigue.
  
  
  METHODS
  A random sample of 18,675 respondents in Chicago received a brief telephone questionnaire designed to identify individuals with chronic fatigue. A group of 780 (4.2%) with chronic fatigue received further interview via telephone questionnaire involving characteristics of their fatigue. The analyses for this study were based on those people identified with having chronic fatigue. A factor analysis was conducted on responses to questionnaire items, and a four-factor solution emerged. Mean factor scores were derived and analyzed in relation to sociodemographic characteristics and sample subgroups.
  
  
  RESULTS
  The four factors were labeled: Lack of Energy, Physical Exertion, Cognitive Functioning, and Fatigue and Rest.
  
  
  CONCLUSIONS
  Results indicated that individuals with chronic fatigue have symptoms that can be differentiated into theoretically distinct factors.
authors.affiliation: Department of Psychology, DePaul University, Chicago, IL 60614, USA. ljason@wppost.depaul.edu
authors.forename: Leonard A
authors.initials: LA
authors.lastname: Jason
authors.forename: Renee R
authors.initials: RR
authors.lastname: Taylor
authors.forename: Cara L
authors.initials: CL
authors.lastname: Kennedy
authors.forename: Karen
authors.initials: K
authors.lastname: Jordan
authors.forename: Cheng-Fang
authors.initials: CF
authors.lastname: Huang
authors.forename: Susan
authors.initials: S
authors.lastname: Torres-Harding
authors.forename: Sharon
authors.initials: S
authors.lastname: Song
authors.forename: Danielle
authors.initials: D
authors.lastname: Johnson
mesh_terms: D000328:Adult; D000368:Aged; D002641:Chicago; D003430:Cross-Sectional Studies; D005163:Factor Analysis, Statistical; D015673:Fatigue Syndrome, Chronic / Q000145:classification* / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D012044:Regression Analysis; D012959:Socioeconomic Factors