Predictive organisms are mostly clostridia.

Numbers of predictive organisms per each implicated high-level phylogenetic group (L1, see section 2.2. for explanation), compared to the total number of species in the L1 group. Odds ratio >1 indicates that the group contains more predictive phylotypes than expected based on the total number of phylotypes in the group. Statistical significance of the odds ratio was estimated with the Fisher's test.