Changes in rates of depressive symptoms in a Japanese working population: life-table analysis from a 4-year follow-up study.
To investigate the effects of demographic variables on changes in rates of depressive symptoms in a non-clinical population, a 4-year follow-up study was conducted on a total of 6378 employees of a Japanese electrical company. Data were collected five times at 1-year intervals (T0-T4) using a questionnaire that included the Zung Self-rating Depression Scale (SDS). Of the non-depressed (i.e. having a SDS score of 47 or less) at baseline (N = 4857), 14% were found depressed at least once during T1-T4. Younger, never married, female and blue-collar workers were significantly at greater risk for becoming depressed during the follow-up period (P < 0.05). Of the depressed at baseline (N = 505), 20% were depressed every time during T1-T4. Younger workers were significantly at greater risk for persistence of depressive symptoms during the follow-up period (P < 0.05). The results suggested that age is associated with both occurrence and persistence of depressive symptoms, while gender, marital status and occupation are associated only with the occurrence.
Kawakami
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N
Department of Public Health, Faculty of Medicine, University of Tokyo, Japan.
Roberts
R E
RE
Lee
E S
ES
Araki
S
S
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D003866:Depressive Disorder / Q000175:diagnosis / Q000453:epidemiology* / Q000523:psychology; D004651:Employment; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007564:Japan / Q000453:epidemiology; D008297:Male; D017533:Marital Status; D012737:Sex Factors