1. Epidemiology and Global Health
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Heterogeneous contributions of change in population distribution of body mass index to change in obesity and underweight

Research Article
Cite this article as: eLife 2021;10:e60060 doi: 10.7554/eLife.60060
9 figures and 8 additional files

Figures

Schematic diagram of contribution of change in mean body mass index (BMI) to change in total prevalence of underweight or obesity.

(A) Change in the prevalence of underweight and obesity if the distribution shifts, represented by a change in its mean and its shape. In this example, the change (shown as the difference between blue and gray) results in a small decrease of underweight and a large increase in obesity. (B) Change in the prevalence of underweight and obesity when only mean BMI changes (shown as the difference between orange and gray), without a change in the shape of the distribution.

Number of data sources with participants aged 20-79 years.
Change in mean body mass index (BMI) from 1985 to 2016 by region, sex, and age group.
Change in prevalence of underweight, obesity, and severe obesity from 1985 to 2016 by region, sex, and age group.
Contribution of change in mean body mass index (BMI) to total change from 1985 to 2016 in prevalence of underweight, obesity, or severe obesity by region, sex, and age group.

Blue arrows show the total change in prevalence of underweight, obesity, or severe obesity. Orange arrows show the contribution of change in mean BMI to the change in prevalence. The difference between these two arrows is shown with a line, whose colour follows the shorter arrow.

Author response image 1
Standard deviation of BMI from 1985 to 2019 by sex and age group.

Each point shows one age-sex group in one study. The size of each point is proportional to its sample size. Colour for each point indicates the region it is from.

Author response image 2
Skewness of BMI from 1985 to 2019 by sex and age group.

Each point shows one age-sex group in one study. The size of each point is proportional to its sample size. Colour for each point indicates the region it is from.

Author response image 3
Distributions of BMI in NCD-RisC studies for 50-59-year old by sex and region.

Each curve is a single study and the colour indicates its year from 1985 to 2019.

Author response image 4
Comparison of mean and median BMI by sex and age group.

Each point represents a sex-age group in a study conducted between 1985 and 2019.

Data availability

Names and characteristics of data sources included in this pooling analysis are listed in Supplementary file 4. Of these data, some are from public sources, for which we have provided the data in Source data 1. Others are from individual researchers and/or from government and international agencies; these should be requested from the data holders on a study to study basis using the information in Source data 1.

Additional files

Supplementary file 1

Coefficients of the regression of probit-transformed prevalence of underweight, obesity, and severe obesity in women on mean body mass index.

https://cdn.elifesciences.org/articles/60060/elife-60060-supp1-v1.docx
Supplementary file 2

Coefficients of the regression of probit-transformed prevalence of underweight, obesity, and severe obesity in men on mean body mass index.

https://cdn.elifesciences.org/articles/60060/elife-60060-supp2-v1.docx
Supplementary file 3

List of analysis regions and countries in each region.

https://cdn.elifesciences.org/articles/60060/elife-60060-supp3-v1.docx
Supplementary file 4

List of data sources used in the analysis and their characteristics.

https://cdn.elifesciences.org/articles/60060/elife-60060-supp4-v1.docx
Supplementary file 5

Mean body mass index estimates (kg/m2) in 1985 and 2016 stratified by region, gender, and age group.

https://cdn.elifesciences.org/articles/60060/elife-60060-supp5-v1.docx
Source data 1

Data from studies in the Non-Communicable Disease Risk Factor Collaboration database conducted from 1985 to 2019 with participants aged 20–79 years old.

https://cdn.elifesciences.org/articles/60060/elife-60060-data1-v1.xlsx
Source code 1

Liner regression model used for the analysis of the association of prevalence of underweight, total obesity, and severe obesity with mean body mass index.

https://cdn.elifesciences.org/articles/60060/elife-60060-code1-v1.zip
Transparent reporting form
https://cdn.elifesciences.org/articles/60060/elife-60060-transrepform-v1.pdf

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