Fatigue as related to anxiety and depression in a community-based sample of twins aged over 50.
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.
Kirk
K M
KM
Epidemiology Unit, Queensland Institute of Medical Research, Royal Brisbane Hospital, Australia. kathe@qimr.edu.au
Hickie
I B
IB
Martin
N G
NG
D001008:Anxiety Disorders / Q000523:psychology*; D003866:Depressive Disorder / Q000523:psychology*; D005221:Fatigue / Q000209:etiology* / Q000523:psychology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires