Factor analysis of unexplained severe fatigue and interrelated symptoms: overlap with criteria for chronic fatigue syndrome.

摘要: The objective of this study was to identify factors explaining the correlations among unexplained severe fatigue different durations (1-5 months or > =6 months) and symptoms reported as being significant health problems during a preceding 4-week period. Between June December 1994, cross-sectional, random digit dialing telephone survey conducted residents San Francisco, California. All subjects who having lasting for =1 month sample nonfatigued were asked participate in detailed interview. Data from 1,510 individuals aged 18-60 years did not have medical psychiatric conditions that could explain their analyzed. Common factor analyses identified three correlated (defined "fatigue-mood-cognition" symptoms, "flu-type" "visual impairment") explained 14 interrelated symptoms. No 1-5 other combination months' duration selected overlaps with published criteria used define cases chronic syndrome (CFS). Although described appearing within month, CFS must been present previous 6 months, these results provide empirical support interrelations included case definition.