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Change in breath methane production from initial reading after consuming 35 mL of lactulose in patients who had at least one level lower than their initial reading. Levels are normalized to a starting value of 0 to more clearly show that methane levels for some people dropped below their initial value. Breath methane levels were measured by gas chromatography on a GastroCH4ECK (Bedfont Scientific Ltd., Kent, UK). Patient IDs are indicated on the right‐hand side of the graph.
