Elsevier

Nutrition

Volume 31, Issues 7–8, July–August 2015, Pages 1056-1057
Nutrition

Letter to the Editor
Correction of data errors and reanalysis of “The effect of glucomannan on body weight in overweight or obese children and adults: A systematic review of randomized controlled trials”

https://doi.org/10.1016/j.nut.2015.02.008Get rights and content

Section snippets

Description of the error(s)

Figure 2 in the meta-analysis [1] reported the SDs for the changes of body weights from different studies. However, the reported SDs from the study by Keithley et al. [2] were incorrect. Specifically, the reported SDs in the meta-analysis [1] were 0.18 and 0.08 for the glucomannan (GM) and placebo groups after a 2-wk treatment, and 0.08 and 0.43 for the GM and placebo groups after an 8-wk treatment. These values are different from those reported in the original study [2], in which they were

Revised results with the error(s) corrected

Data for weight change in the GM group compared with placebo group were recomputed using correct SDs (Fig. 1). No significant differences in weight loss between groups were noted after the 2-wk treatment (MD, 0.21; 95% CI, −0.47 to 0.89), nor after the 8-wk treatment (MD, −0.03; 95% CI, −1.04 to 0.98). The effect of treatment after 2 wk that was originally reported as statistically significant in the meta-analysis published turned out to be insignificant after the correction. However, the

Conclusion

We were glad to have this opportunity to work together to correct these errors and hope the results are useful to the scientific community.

Acknowledgments

Supported in part by NIH grants R25 HL124208 and P30 DK056336. The opinions expressed are those of the authors and do not necessarily represent those of the NIH or any other organization.

References (2)

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