Tamar Yogev

The strength of family ties: A meta-analysis and meta-regression of self-reported social support and mortality

Perceived social support has long been recognized as associated with better health and longevity. However, important factors that may moderate this relationship have not been sufficiently explored. The authors used meta-analyses and meta-regressions to examine 178 all-cause mortality risk estimates from 50 publications, providing data on more than 100,000 persons. The mean hazard ratio (HR) for mortality among those with lower levels of perceived social support was 1.11 (95% confidence interval [CI]: 1.05, 1.17) among multivariate-adjusted HRs. Metaregressions suggest that support from family members was more beneficial than support provided by friends, and that a moderate level of support may be enough to achieve positive results. The results also show that the HR increases with age, but no substantial difference was found between men and women in the magnitude of the risk.

The Rising Relative Risk of Mortality for Singles: Meta-Analysis and Meta-Regression

Never-married persons (singles) constitute a growing demographic group; yet, the magnitude of the all-cause relative mortality risk for nonelderly singles is not known and important moderating factors have not been explored. The authors used meta-analysis to examine 641 risk estimates from 95 publications that provided data on more than 500 million persons. The comparison group consisted of currently married individuals. The mean hazard ratio for mortality was 1.24 (95% confidence interval: 1.19, 1.30) among multivariate-adjusted hazard ratios with a high subjective quality rating. Meta-regressions showed that hazard ratios have been modestly increasing over time for both genders, but have done so somewhat more rapidly for women. The results also showed that the hazard ratio decreased with age and that study quality has an important relation to hazard ratio magnitude.

Network Dynamics and Market Structure: The Case of Art Fairs

Annual art fairs are a crucial element of the contemporary art market. Art galleries represent artists and exhibit their work at fairs all over the world. These fairs expose the gallery and its artists and create and maintain relationships with key actors in the global art market. Using data recording artists and galleries presenting at art fairs alongside qualitative interviews with different actors operating in the art market, we study the development of the art fair network over three years, 2005–2007. Our findings suggest significant network and homophily effects regarding the status and age of artists at fairs. However, the internationality of fairs and geographic distances between them do not seem to have any effect.