Fatigue as related to anxiety and depression in a community-based sample of twins aged over 50
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- Kirk, K., Hickie, I. & Martin, N. Soc Psychiatry Psychiatr Epidemiol (1999) 34: 85. doi:10.1007/s001270050116
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Measures of fatigue, anxiety and depression were administered in self-report questionnaire format to a community-based sample of 2703 Australian twins aged over 50. Factor analysis indicated that a two-factor solution was appropriate and demonstrated a clear separation between fatigue-related items and questionnaire items relating to anxiety and depression. Highly congruent factor structures were derived for male and female subjects.