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Distribution of rectal bleeding [RB] and stool frequency [SF] items across UCEIS levels. A: When UCEIS ≤ 1, no RB > 95% of the time; when UCEIS ≥ 6, some RB 95% of the time. B: When UCEIS ≤ 1, no increase in SF ~ 90% of the time; when UCEIS ≥ 5, increase in SF 95% of the time.
