Figure 1.

Differences in measured pretreatment uracil levels between hospitals. Differences in uracil concentrations (ng/mL) between the participating hospitals in an explorative substudy of a prospective multicenter study in 955 patients (clinicaltrials.gov identifier NCT02324452). All the samples were measured centrally therefore, the central hospital was chosen to be the reference hospital (indicated in red). Differences between medians were determined using one‐way analysis of variance (Kruskal–Wallis). *P ≤ 0.05; ***P ≤ 0.001; ****P ≤ 0.0001. [Colour figure can be viewed at wileyonlinelibrary.com]