Fig. 3
From: Tiny microbes, enormous impacts: what matters in gut microbiome studies?
Relative effect sizes of biological covariates on the human microbiome. Principal coordinates projection of unweighted UniFrac distance, using data from Yatsunenko et al. [45], shows a age (blue gradient; missing samples in red) separating the data along the first axis and b country (USA, orange; Malawi, green; Venezuela, purple) separating the data along the second principal coordinates axis. c Body mass index in adults has a much more subtle effect, and does not separate along any of the first three principal coordinate axes (normal, red; overweight, green; obese, blue; missing samples, gray)