Age and gender differences in the factor structure of the Center for Epidemiological Studies Depression Scale among Japanese working individuals

Objectives: Depression is a serious mental illness with a high rate of prevalence. Depressive sympotomatology is heterogeneous and is expressed as a combination of emotional, physical, cognitive, and social symptoms. The objective of this study was to examine differences in the factor structure of the Center for Epidemiologic Studies Depression Scale (CES-D) among Japanese working individuals of differing age and gender using exploratory factor analysis (EFA). Methods: This study examined the factor structure of the CES-D in a sample of 6696 Japanese working individuals aged 20 and older. To examine within-group differences in the structural characteristics of the CES-D, the participants were stratified by age subgroup. Results: The EFA with promax rotation identified three factors among the participants. These factors were labeled depressed and negative complaints (DEP), somatic and apathetic complaints (SOM), and positive affect (POS). Although the three factors were comparable for males in their 20-50s and females in their 20s and 30s, the content of these factors varied for other subgroups. For females in their 40s and 50s, items 15 and 19 (belonging to Radloff's original interpersonal problem factor) constituted an independent factor. For all individuals in their 60s, items that were not included in the SOM and POS factors constituted new factors that were not observed for participants in their 20s-50s. Conclusion: These findings indicate that age and gender could affect the factor structure of the CES-D among Japanese working individuals. Psychosocial or biological factors might contribute to the age- and gender-related differences in the factor structure of the CES-D. (C) 2014 Elsevier Inc. All rights reserved.