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. 2018 May 30;139(3):599–608. doi: 10.1007/s11060-018-2899-0

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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.

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Fig. 1 — Kaplan–Meier curves for survival according to age, comorbidity status at diagnosis, sex, tumour grade, educational level or income level. Estimated survival rate at 1 year and 5 years after diagnosis is reported in each graph. Tests of statistical significance of differences between groups were performed using log-rank test for equality of survivor functions (p_(age) = 0.000, p_{(comorbidity)} = 0.001, p_(sex) = 0.121, p_{(tumour grade)} = 0.000, p_{(educational level)} = 0.095, p_{(income level)} = 0.028)