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Ratio of cis‐urocanic acid (UCA) to total UCA (cis‐UCA + trans‐UCA) (median with interquartile range). Age groups: < 48 h (n = 18), 48 h – 4 weeks (n = 18), 1–3 months (n = 21), 4–11 months (n = 20), 12–23 months (n = 1), 24–35 months (n = 14), 36–47 months (n = 12) and 48–72 months (n = 18). Differences between age groups were determined by Kruskal–Wallis test followed by Dunn's multiple comparisons test. ***P < 0.001, **P < 0.01 and *P < 0.05.
