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. 2014 Jan 17;4(1):e004026. doi: 10.1136/bmjopen-2013-004026

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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://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) 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/3.0/

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Association between maternal age and intrapartum interventions and adverse maternal outcomes in low-risk women aged 16 and over. NOTE: Graphs are plotted on different scales: 0–100% for nulliparous women and 0–50% for multiparous women. (A) Maternal composite, nulliparous women. (B) Augmentation, nulliparous women. (C) Instrumental delivery, nulliparous women. (D) Intrapartum caesarean section, nulliparous women. (E) Maternal composite, multiparous women. (F) Augmentation, multiparous women. (G) Instrumental delivery, multiparous women. (H) Intrapartum caesarean section, multiparous women.