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. 2020 Aug 26;10(8):e034839. doi: 10.1136/bmjopen-2019-034839

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Relationship between maternal age and smoking during the second and third trimesters of pregnancy by socioeconomic status among nulliparous (A) and multiparous women (B), from 2000 to 2015 in Finland. Error bars indicate 95% CIs.