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Correlation between p.Val15Phe genotype and stool frequency. Mean (±SD) number of bowel movements per day (stool frequency, y-axis) is reported for Population-based Colonoscopy Study individuals (with available diary data) stratified according to the genotype at the p.Val15Phe single nucleotide polymorphism site (x-axis). The Spearman’s p value for the correlation test is also reported.
