Review for 10.1186/s12876-021-01800-x (2021)

Reviewer’s report
Title: 
Risk factors associated with functional dyspepsia in Chinese children:  a cross-sectional study
Version: 
1 
Date: 
09 Mar 2021
Reviewer's report:
Comments are listed below
1) Living independent of parents is associated with bad eating habits. Other factors like prolonged school
meals" or " eat daily cold food" may be linked to this factor. I think all these factors actually come from
one risk factor -living far away from parents- . Chlidren who must stay at school for education must eat
prolonged school meal or cold foods. Although authors found these factors statitically significant risk
factors seperately; I think they have close relationship with each other. Authors should discuss this issue in
the discussion section 
2) " Often/daily eat cold foods" and " often eat pickled foods" seems to be pending factors. Authors should
explain what they mean when they mention " often". For exmaple what is the difference from Daily eat.
How many times a week can be identified as " often "
3) Authors stated that dyspepsia is gastrointestinal disorder characterised by symptoms such as abdominal
pain, epigastric burning, postprandial fullness and early satiation. Dyspepsia is a group of heterogenous
symptoms and there are many reasons that cause dyspepsia ( peptic ulcer, celiac disease, infections etc).
Functional dyspepsia is defined as a functional disorder that describes a gastrointestinal condition that
physician cannot find cause related to an organic or systematic disease and it is a chronic disorder that
must be go on at least 6 months. I suggest authors to use the term 
" functional dyspepsia" instead of
"dyspepsia" in manuscript because they used the ROME IV criteria. 
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