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Table 1 Selection criteria for inclusion and exclusion

From: The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data

Inclusion 1. Randomized placebo-controlled trials comparing peppermint oil and placebo for irritable bowel syndrome with a minimum treatment duration of 2 weeks.
2. Adult patients with irritable bowel syndrome as diagnosed using any of the following criteria for IBS: Manning, Rome I, II, III, IV diagnostic criteria.
Exclusion 1. Non-randomized trials; observational studies such as cohort study, cross-sectional study, etc..
2. Patients having organic disease or or did not have organic disease excluded.
3. Treatment duration of less than 2 weeks.
4. Studies with inadequate data.