Fig. 1.

Boxplots displaying bacterial taxa in healthy (a) and functionally constipated (b) baseline samples of faecal microbiota that are present at greater than 1 % abundance in at least one sample. The genera in bold font are significantly more abundant compared with the other group, as calculated by the Wilcoxon signed rank test after false discovery rate correction for multiple comparisons (P ≤ 0·05). Ruminococcus_R, from Ruminococcaceae family; Ruminococcus_L, from Lachnospiraceae family.