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The questionnaire based BSFS is one of the most widely used scales in both clinical and research settings. The BSFS is a Likert scale used to classify stool forms into seven categories, and it has been validated as a surrogate measure for GI transit time as a diagnostic tool designed to classify the shape and type of human feces into seven distinct categories: separate hard lumps, like nuts (=1); sausage-shaped, but lumpy (=2); like a sausage, but with cracks on its surface (=3), like a sausage or snake, smooth and soft (=4); soft blobs with clear-cut edges (=5); fluffy pieces with ragged edges, mushy stool (=6); and watery, no solid pieces, entirely liquid (=7) [24].