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146 Chapter 6 SUPPLEMENTARY FILE 4. Proportion of correct allocations in the a priori grouped BITSS scale Photo 2 (BSFS 1) % Photo 5 (BSFS 2) % Photo 4 (BSFS 3) % Photo 6 (BSFS 4) % Photo 3 (BSFS 5) % Photo 1 (BSFS 6) % Photo 7 (BSFS 7) % Hard (BSFS 1-2) 86.7 76.9 31.6 1.9 2.2 0.7 0.1 Normal (BSFS 3-4) 10.1 18.5 66.1 91.1 11.5 1.6 1.1 Loose (BSFS 5) 2.8 4.0 1.2 5.8 68.0 14.1 4.1 Watery (BSFS 6-7) 0.5 0.6 1.2 1.2 18.3 83.6 94.6 BSFS: Bristol Stool Form Scale Green cells: allocation matches the reference BSFS type for corresponding photograph Orange cells: allocation deviates by 1 level from the reference BSFS type for corresponding photograph Red cells: allocation deviates by more than 1 level from the reference BSFS type for corresponding photograph