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The study tested the hypothesis that soy polysaccharide fiber reduces clinical symptoms of chronic constipation.
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The study was performed out at outpatient clinic of Pediatric Gastroenterology at the Federal University of São Paulo (São Paulo, Brazil), located in the southeastern region of Brazil. It is a public referral hospital for pediatric gastroenterology attendance in the Metropolitan area of the São Paulo and in Brazil. In general, the patients go to consultation after a referral from a primary care center.
Study design and sample size The design was a randomized double-blind trial, placebo-controlled study. Sample size was calculated by the formula of comparison of two proportions, using clinical improvement as a primary outcome. It had been previously calculated that a minimum of 14 patients in each group will give a power of 80% to detect a effect size of 50% with significance at the level of 5% (one-sided).
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30 participants in 2 patient groups, including a placebo group
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Data sourced from clinicaltrials.gov
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