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Bar graph illustrating the prevalence of low nasal NO (nNO) by stage of congenital heart disease (CHD) repair. Both patients with Fontan single‐ventricle (SV) and transplanted CHD had a significantly higher prevalence of low nNO than both subjects with biventricular CHD and control subjects. Patients with pre‐Fontan SV CHD had a higher prevalence of low nNO than controls. The asterisk indicates Bonferroni adjustment for 10 comparisons (0.05/10=0.005).
