Intraclass correlation coefficients (ICCs) for reliability of the relative abundances of the functional species involved in short-chain fatty acid (SCFA) production (A), functional genera involved in secondary bile acid (SBA) metabolism (B), and their related metabolites (C). Abbreviations: BA, butyric acid; AA, acetic acid; PPA, propionic acid; IVA, isovaleric acid; CA, caproic acid; TCA, taurocholic acid; GCA, glycocholic acid; DCAGC, deoxycholic acid-glycine conjugate; LCAGC, lithocholic acid-glycine conjugate; TLCA, taurolithocholic acid; TDCA, tauroursodeoxycholic acid; CAG, cholic acid glucuronide; GDCA, glycochenodeoxycholic acid 3-glucuronide.