Reviewer’ s report
Title: Relationship of Breastfeeding Duration with Joint Pain and Knee Osteoarthritis in Middle-
aged Korean Women: A Cross-sectional Study using the Korea National Health and NutritionExamination Survey
Version: 1Date: 07 Aug 2020
Reviewer's report:
This review is primarily statistical in nature. I very much appreciate the rigorous and thorough
response of the authors to my prior set of comments, including the details in the Appendix. I haveonly a few more minor comments pertaining to this revision.
Page 12, Line 19: Please clarify which groups are being compared through this odds ratio.Page 17, Line 7: Please restate to indicate the results are adjusting for the effects of these
confounders, and add description of modeling with the dichotomized version of breastfeedingstatus.
Page 18, Line 9: This sentence should be reworded to reflect the groups having the greatest
percentages in the highest level of income.
Page 18, Lines 25 and 34: 'OR' should be 'odds' in both places.Page 24, Line 4: 'OR' should be 'odds'.
Tables 2, 3, 4, 5: Please clearly indicate these factors were assess through separate models. The
dichotomized version should also be described in the Methods.
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Declaration of competing interests
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1. Have you in the past five years received reimbursements, fees, funding, or salary from an
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5. Do you have any other financial competing interests?6. Do you have any non-financial competing interests in relation to this paper?
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If your reply is yes to any, please give details below.
I declare that I have no competing interests.Reviewer Publication Consent. I agree for my report to be made available under an Open Access
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(default)
Is the study design appropriate to answer the research question (including the use of appropriate
controls), and are the conclusions supported by the evidence presented?
YesAre the methods sufficiently described to allow the study to be repeated?Yes
Is the use of statistics and treatment of uncertainties appropriate?
YesIs the presentation of the work clear?YesAre the images in this manuscript (including electrophoretic gels and blots) free from apparent
manipulation?
Yes