Intra-class correlation coefficients (ICCs) and variances of country level random components in multilevel linear regressions.

*<p>p value<5 percent. “Intercept only” model is a multilevel model with no covariates other than the constant. “ICC” stands for “intraclass correlation coefficient”, which is calculated as the ratio of country-level variance versus total variance in the intercept-only model, and can be interpreted as the proportion of total variance attributed to the country level. The key independent variable in model 1 is “social support”; in model 2 the key independent variable is “volunteering”; in model 3 the key independent variable is “social trust”. All models control for age, gender, education, household income, marital status, religiosity, and year dummy variables.