The American Journal of Gastroenterology · 1999 · 455 citations · 22 references
Constipation is a heterogeneous condition. Differences in epidemiological profile by age, sex ratio, and relation to other sociodemographical factors support the distinction of two and possibly more symptom-based subtypes.
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The MOS Short-form General Health Survey
Anita L. Stewart, Ron D. Hays, John E. Ware · Medical Care · 1988 · 3.3K citations
Defecation frequency and timing, and stool form in the general population: a prospective study.
K W Heaton, J Radvan, H. Cripps et al. · Gut · 1992 · 738 citations · Full text
Functional Gastrointestinal Disorder, Stool Form, Medicine +10