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. 2022 Jan 11;8:811244. doi: 10.3389/fnut.2021.811244

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Copyright © 2022 Li, Yang, Yin, Liu, Wang, Yang, Wang, Chen, Li, Yang, He and Huang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Association between survey years and BMI among adults aged 20 years and older in northern and southern China, 2012–2020. Surveyed year was coded using the RCS function with three knots located at the 5th, 50th, and 95th percentiles of the distribution of survey years. Y-axis represents the BMI difference from referenced year. Referenced year in (A–C) was 2014, and in (D–F) was 2012. Dashed lines are 95 percent confidence intervals. Knots are represented by dots. In (A) and (D), age and sex were included as adjustment variables. In (B,C,E,F), age was included as an adjustment variable. BMI, body mass index.