Matching summary.

Top: matchit function call used for 1:4 matching of vegetarian and nonvegetarian participants for use in effects estimation analysis. Middle: Summary of balance for all data and for matched data shows the results of matching on relevant lifestyle factors and genetic principal components one through five. Bottom: Sample sizes in control (nonvegetarian) and treated (vegetarian) samples before and after matching. Std. Mean Diff., standardized mean difference; Var. Ratio, variance ratio; eCDF Mean, mean empirical cumulative density functions to assess imbalance across entire covariate distribution; eCDF Max, maximum eCDF difference, also known as the Kolmogorov-Smirnov statistic. (XLSX)