Being able to draw accurate conclusions from childhood obesity trials is important to make advances in reversing the obesity epidemic. However, obesity research sometimes is not conducted or reported to appropriate scientific standards. To constructively draw attention to this issue, we present 10 errors that are commonly committed, illustrate each error with examples from the childhood obesity literature, and follow with suggestions on how to avoid these errors. These errors are as follows: using self-reported outcomes and teaching to the test; foregoing control groups and risking regression to the mean creating differences over time; changing the goal posts; ignoring clustering in studies that randomize groups of children; following the forking paths, subsetting, p-hacking, and data dredging; basing conclusions on tests for significant differences from baseline; equating “no statistically significant difference” with “equally effective”; ignoring intervention study results in favor of observational analyses; using one-sided testing for statistical significance; and stating that effects are clinically significant even though they are not statistically significant. We hope that compiling these errors in one article will serve as the beginning of a checklist to support fidelity in conducting, analyzing, and reporting childhood obesity research.
Bibliographical noteFunding Information:
Funded in part by NIH grants R25DK099080, R25HL124208, P30DK072476, and P30DK040561; USDA/ARS under Cooperative Agreement No. 58-3092-5-001; and DARPA grant D17AC00001. The content is solely the responsibility of the authors and does not necessarily represent the official views of any of these agencies or any other organization.
© 2019 World Obesity Federation
- causal inference
- childhood obesity