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. 2016 Mar 25;3(1):e000338. doi: 10.1136/openhrt-2015-000338

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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Comparison between Kaplan-Meier survival estimates of Bristol aortic valve surgery patients and the Monte Carlo-based generated Kaplan-Meier curve using the matched ONS population. It appears that for a follow-up period of <8 years, the difference between the survival estimates is not significant (p=0.55) using log-rank test for equality of survivor functions. However, for longer periods of follow-up, the difference becomes increasingly significant with p<0.0001 for the entire follow-up period. ONS, Office for National Statistics.