Fig. 3.

Bland and Altman statistics (plot of differences between pairs vs. their means) of the short-term (filled squares) and medium-term (open squares) reproducibilities of parameters characterizing methane breath excretion after a p.o. lactulose load.

CH_{4_bas}: basal fasted hydrogen; max CH_{4_net}: maximum net increment over baseline; AUC CH_{4_net}: area under the curve of the net increment of hydrogen; the respective borders of the 95% confidence intervals are plotted in each panel (cf. the legend in the bottom panel).