Title:  Prevalence and factors associated with child marriage, a systematic review
Version: 5 Date: 23 Jun 2023
Reviewer's report:
The revised article has much improved.But still there are some concerns, specially in interpreting
the findings of included studied, that highly affect the validity of finding and should be addressed
by the authors.
Methods:
Thank you for editing the figure1.It still needs some correction. The box in the right side, should
go a bit upper. For example the file that enters to duplicated box should locate at the middle of
the file that comes from the Identification box to screening box. Actually you want to say that
from 2832 identified articles, 773 were duplicated. Please revise all boxes accordingly.
Result: Related factor to child marriage
Thank you for revising this section it is improved but there are still some problems that should be
addressed. It is very important that a reader just buy reading your findings and without any need
to read the references you use can understand what you mean. For example in line 6 you stated
that age under 18 years is associated with child marriage. What does it mean? As all of your
sample married under the age of 18, it is meaningless to say "age under 18 years is associated
with marriage under the age of 18".
There is also misinterpretation of data that hugely affect the validity of article and make it
unpublishable. For example you refered  to Christian(based on reference number 52) as a factor
associated with child marriage. However  as I checked the article you referred to, I realized that
this interpretation is completely wrong. In table 2 of this article, other religion are compared to
Christians. Actually Christian is the reference group. Considering odds ratio, this table indicate
that compared to chridstians, muslim, spiritualists and people with no religion have more chance
of getting married in childhood which is 180 degree in  opposite meaning that you mentioned in
the text.The same thing happened to residency status. This article says that being rural is a risk
factor. However in your text you refered to this articles as being urban.
Or in another section, you stated that Hinduism is associated with childhood marriage and
referred to reference number 60.However, the refered article is just a descriptive article in which
no measure of association is reported. It is true that majority of respondets are Hindu but it doesn't
mean that religion is associated with child marriage. In contrast its just because that majority of
people in Bangladesh believe in Hinduism and this majority represent itself in your sample too.
You must ask a statisticians to review all of your included articles and help you in interpretation
of associations based on odds ratios and other major of effect.
Furthermore, I recommend to classify the factors and report the findings in each subcategory
separately. For example: individual factors, household factors, partner factors, general  Laws,
Environmental factors(such as development , region) Factors related to religion and ethnics.
Or for example you stated household (42) is associated with child marriage.What do you mean?
How can household be related to child marriage?
Or in another line you stated Respondents' first gender age. What do you mean of fisrt gender
age?
Number of sibling? Having more or less sibling do you mean.
Age of parents at the time of marriage? Being younger or older?
Number of respondent unions before marriage. What is the respondent union? How its number
is associated?
Development level of the province: being well developed or less developed?
Birth interval? It seems in this case child marriage is the predictor and not outcome. Don't forget
that you want to study the factor that increase the chance of child marriage and not how child
marriage can influence other outcomes such as the time form marriage to first child delivery.
Please consider this in presenting you finding and remove other similar findings from your result
section.
In line 13 of this section:"The other relevant factors are the knowledge of complications of
marriage in childhood, consequences of pregnancy, marriage laws, knowledge of complications
of marriage in childhood, consequences of pregnancy, marital law (38, 43, 62, 65)",The
sentences are duplicated.