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. 2016 May 11;3(1):e000413. doi: 10.1136/openhrt-2016-000413

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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 Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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Persistency curves of boys and girls delivered vaginally and by caesarean delivery (summary). The life survival time curves were based on hypothesised logarithmic logistic distribution (B using LIFEREG) and confirmed by the curves using the ICLIFETEST (A). DA, ductus arteriosus.