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Center-level volume over time, log scale. Distribution of annual center-level volume (log2-scale) over time by age group (colors). Boxes cover the middle 50% and whiskers cover the middle 80%. Center volume for neonatal/pediatric centers: 2009: median 12, interquartile range (IQR) 6, 23; 2021: 8 (2, 18.5); 2022: 7 (2, 17); Center volume for adult centers: 2009: 4 (1, 12); 2021: 20 (7, 48); 2022: 15 (6, 36).
