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. 2021 Sep 24;2(9):773–784. doi: 10.1302/2633-1462.29.BJO-2021-0060.R1

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© 2021 Author(s) et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (CC BY-NC-ND 4.0) licence, which permits the copying and redistribution of the work only, and provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc-nd/4.0/

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Fig. 2 — Baseline age heterogeneity *For UK FROST, total number of patients in each group were divided by three, to account for multiple comparisons. CI, confidence interval.