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. 2021 Jun 28;11(6):e044829. doi: 10.1136/bmjopen-2020-044829

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© Author(s) (or their employer(s)) 2021. 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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Prevalence of SHS exposure among children is derived from maternal self-report (exposed/unexposed), depicted with a triangle, and also from serum cotinine concentrations, depicted with a square, applying assay LOD derived cut-point of 0.015 ng/mL (upper) and age-specific cut-points of 0.11 ng/mL at 12 months; 0.08 ng/mL at 24 months; 0.05 ng/mL at 36 months; and 0.04 ng/mL at 48 months (bottom). LOD, limit of detection; ROC, receiver operating characteristic; SHS, secondhand tobacco smoke.