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. 2018 Sep 3;38:55. doi: 10.1186/s40880-018-0324-x

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Calibration plot and survival curves for each of the investigated subgroups. a Calibration plot. Nomogram-predicted outcomes were stratified into three equal subgroups. For each subgroup, the average predicted probability [x-axis: nomogram-predicted 5-year overall survival (OS)] was plotted against the Kaplan–Meier calculated outcome (y-axis: observed 5-year OS). The 95% confidence intervals of the observed 5-year overall survival rate are indicated by the vertical lines. The dashed line indicates the position of an ideal nomogram. b Survival curve stratified by risk group