Reviewer’s report
Title: 
A meta-analysis of the association between physical demands of domestic
labor and back pain among women
Version: 
0 
Date: 
23 Jan 2021
Reviewer's report:
It is an interesting subject to address through a systematic review. It can be
intuitively derived that phsyically demanding work would have an important role
for back pain.
However, it is unclear for the use of the term "unpaid" in the manuscript.
Women in low resource countries undertake heavy household chores- not
specifically as an employee but mainly as a homemaker.
It is important to clarify if these group of women have also been included in the
study since it is not clear from the details of studies included in the review.
It is also important to note that the results would have many confounders starting
from the basic health status, malnutrition, parity etc
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