A meta-analysis of social capital and health: a case for needed research.

Social capital refers to various levels of social relationships formed through social networks. Measurement differences have lead to imprecise measurement. A meta-analysis of eligible studies assessing the bivariate association between social capital and self-reported health and all-cause mortality was performed. Thirty-nine studies met inclusion criteria, showing social capital increased odds of good health by 27 percent (95% confidence intervals [CI] =21%, 34%). Social capital variables, reciprocity increased odds of good health by 39 percent (95% CI = 21%, 60%) and trust by 32 percent (95% CI =19%, 46%). Future research suggests operationalizing measures by assessing differences by race/ethnicity, gender and socioeconomic status.