Factor structure of Zung self-rating depression scale for workers.
The Zung self-rating depression scale (SDS) was applied to workers of a railway company. A total of 1,784 night-shift workers responded to the questionnaire and 1,394 daytime workers were set as the control group. The average age of the subjects was 39.9. The SDS index decreased with age. A factor analysis was conducted and two factors were obtained having an initial eigen value over 2.0. Factor 1 was the group of 8 positive items, accounting for 18.2%. Factor 2 was the group of 8 depressive items, accounting for 18.1%. Four items including "loss of weight," "constipation," "good appetite," and "partner coping" did not construct a distinct factor. The factor structure of SDS items of the night-shift workers was similar to those of the control group.
Kawada
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Department of Public Health, Gunma University School of Medicine, Maebashi, Japan.
Suzuki
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D000328:Adult; D003866:Depressive Disorder / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D005163:Factor Analysis, Statistical; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D016272:Occupational Health; D010555:Personality Inventory / Q000706:statistics & numerical data*; D011594:Psychometrics; D011890:Railroads; D014937:Work; D014940:Work Schedule Tolerance