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. 2022 Apr 25;158(1):15–22. doi: 10.1007/s11060-022-04001-y

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© The Author(s) 2022

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Fig. 2 — The Rockwood Clinical Frailty Scale (CFS) and Karnofsky Performance Score (KPS) before and 3–6 months after resection are shown as median with interquartile ranges. The Spearman correlation coefficient is noted between corresponding parameters. CFS and KPS correlated strongly with each other preoperatively and at the follow-up visit. There was only a moderate correlation between preoperative and follow-up CFS, as well as between preoperative and follow-up KPS, respectively. NB: Since CFS scores range from 1 to 9 (best to worst) and KPS scores range from 0 to 100 (worst to best), Spearman correlation (r) between two different scales is negative