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Phenotype categories and their observed characteristics.
| Category | I | II | III | IV |
| Phenotypes | B7, Lipoate, K, Xyl, Ara, Rha, Propionate | Man, Rib, Lac, Butyrate | B2, B3, B6, B9, Glc, Gal, Trp | B1, B5, B12, Fru |
| CPI variation | Moderate to large (35.6–49.5) | Moderate (27.7–33.0) | Moderate to small (21.4–32.5) | Moderate (35.1–40.1) |
| Median PAD | Small (3.3–6.4) | Small to moderate (5.1–7.6) | Large (9.8–11.4) | Moderate to large (7.9–10.2) |
