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Severity of symptoms by whether patients produced breath methane. A methane producer was defined as having an initial methane reading of ≥5 ppm. Methane levels were measured by gas chromatography on a GastroCH4ECK. Patients completed a gastrointestinal symptom questionnaire (18) using a 7‐point Likert scale. *P < 0.05; **P < 0.01.
