Comparison of the mean distances between samples observed in the presence/absence (Jaccard) or relative abundance (Yue and Clayton) NMDS plots using matched pairs t-tests.

For subjects who underwent colonoscopy: −1m, −1w, sample obtained one month, one week pre-colonoscopy, +1w, +1m, +3m, sample obtained 1 week, one month, or 3–6 months post-colonoscopy, respectively. For subjects who did not undergo colonoscopy: +3m, sample obtained 3–6 months after the first sample. Figure 5 outlines the sample comparisons for each test. P =