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. 2021 Sep 4;8(6):706–717. doi: 10.1093/nop/npab054

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© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Neuro-Oncology and the European Association of Neuro-Oncology.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Funnel plots displaying rates of (A) advanced preoperative imaging (diffusion tensor imaging [DTI], functional MRI [fMRI], MR spectroscopy [MRS], positron emission tomography [PET]), (B) watch-and-scan, (C) resection rates within 6 months from radiological diagnosis, (D) intraoperative brain mapping during primary resections in presumed eloquent locations, (E) early radiotherapy, and (F) early postoperative radiotherapy plus PCV (procarbazine, lomustine, vincristine) plotted against case volume at each of the 11 treating centers. The target outcome for Y (horizontal solid line) is the observed overall proportion in percentage. The solid funnels represent 95% control limits, while the dotted funnels represent 99% control limits.