Validity analysis on merged and averaged data using within and between analysis: focus on effect of qualitative social capital on self-rated health.
OBJECTIVE
With an increasing number of studies highlighting regional social capital (SC) as a determinant of health, many studies are using multi-level analysis with merged and averaged scores of community residents' survey responses calculated from community SC data. Sufficient examination is required to validate if the merged and averaged data can represent the community. Therefore, this study analyzes the validity of the selected indicators and their applicability in multi-level analysis.


METHODS
Within and between analysis (WABA) was performed after creating community variables using merged and averaged data of community residents' responses from the 2013 Community Health Survey in Korea, using subjective self-rated health assessment as a dependent variable. Further analysis was performed following the model suggested by WABA result.


RESULTS
Both E-test results (1) and WABA results (2) revealed that single-level analysis needs to be performed using qualitative SC variable with cluster mean centering. Through single-level multivariate regression analysis, qualitative SC with cluster mean centering showed positive effect on self-rated health (0.054, p<0.001), although there was no substantial difference in comparison to analysis using SC variables without cluster mean centering or multi-level analysis.


CONCLUSIONS
As modification in qualitative SC was larger within the community than between communities, we validate that relational analysis of individual self-rated health can be performed within the group, using cluster mean centering. Other tests besides the WABA can be performed in the future to confirm the validity of using community variables and their applicability in multi-level analysis.
Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea.
Sang Soo
SS
Shin
Department of Preventive Medicine, Hanyang University College of Medicine, Seoul, Korea.
Young-Jeon
YJ
Shin
D000328:Adult; D000368:Aged; D003627:Data Interpretation, Statistical; D059026:Diagnostic Self Evaluation; D005260:Female; D006304:Health Status; D006306:Health Surveys / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D056910:Republic of Korea; D057566:Self Report; D066270:Social Capital; D012959:Socioeconomic Factors
Health status; Korean; Multilevel analysis; Self-assessment; Social capital