title: The cross-interaction between global and age-comparative self-rated health on depressive symptoms-considering both the individual and combined effects.
abstract: Numerous studies suggesting the relation between self-rated health (SRH) and depression have been reported using different measures. Therefore, we attempted to determine the difference in a depressive scale based on the different ways of measuring health between global SRH (SRH-global) and age-comparative SRH (SRH-age). Then, the combined effect of SRH-global and SRH-age on depressive symptoms was further investigated.
  
  
  
  Data from the Korean Longitudinal Study of Ageing (KLoSA) from 2008 to 2012 were analyzed. We divided the SRH-global and SRH-age into three levels-high, middle, and low-and combined each into nine new categories (SRH-combi). The Center for Epidemiologic Studies Depression Scale-10 Korean edition was used as the dependent variable.
  
  
  
  A total of 8621 participant were enrolled at baseline. Individuals with lower SRHs-age compared to SRH-global tended to be more vulnerable to depressive symptoms. Low SRH-global with low (b = 0.654, p < 0.001) and middle SRH-age (b = 0.210, p = 0.003) showed association with higher CESD scores. Participants with high SRH-global × low SRH-age also had higher scores (b = 0.536, p < 0.001) compared to the "middle SRH-global × middle SRH-age" reference group. In contrast, among the middle (b = -0.696, p < 0.001) and high SRH-global (b = -0.545, p < 0.001) groups, participants with superior SRH-age had statistically lower CESD scores than the reference group.
  
  
  
  Although a sole general SRH has historically been widely used, it has been suggested that use of both general and age-comparative SRH would be more powerful and easy when we consider analyzing depression in old age.
authors.affiliation: Department of Preventive Medicine, Yonsei University, College of Medicine, Seoul, South Korea.|Institute of Health Services Research, Yonsei University, College of Medicine, Seoul, South Korea.
authors.forename: Jaeyong
authors.initials: J
authors.lastname: Shin
authors.affiliation: Department of Preventive Medicine, Yonsei University, College of Medicine, Seoul, South Korea.|Institute of Health Services Research, Yonsei University, College of Medicine, Seoul, South Korea.
authors.forename: Eun-Cheol
authors.initials: EC
authors.lastname: Park
authors.affiliation: Department of Hospital Administration, Graduate School of Public Health, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 210-752, South Korea.
authors.forename: Sang Gyu
authors.initials: SG
authors.lastname: Lee
authors.affiliation: Department of Public Health, Graduate School, Yonsei University, Seoul, South Korea.
authors.forename: Young
authors.initials: Y
authors.lastname: Choi
authors.affiliation: Department of Public Health, Graduate School, Yonsei University, Seoul, South Korea.|Department of Preventive Medicine and Public Health, Ajou University School of Medicine, Suwon, South Korea.|Institute on Aging, Ajou University Medical Center, Suwon, South Korea.
authors.forename: Jae-Hyun
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Hospital Administration, Graduate School of Public Health, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 210-752, South Korea. THKIM@yuhs.ac.
authors.forename: Tae Hyun
authors.initials: TH
authors.lastname: Kim
mesh_terms: D000367:Age Factors; D000368:Aged; D000375:Aging / Q000523:psychology*; D003866:Depressive Disorder / Q000175:diagnosis* / Q000523:psychology*; D005260:Female; D006304:Health Status; D006801:Humans; D007723:Korea; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data; D057566:Self Report
keywords: Age comparative; Combined; Depression; Old aged; Self-rated health