Review for 10.1186/s12876-023-02683-w (2023)

Reviewer’s report
Title: 
Association between air temperature and emergency admission for
esophagogastric variceal bleeding: a case-crossover study in Beijing, China
Version: 
0 
Date: 
09 Jul 2022
Reviewer's report:
Jianhong Chen et al. demonstrated that no association between air
temperature and emergency admission for EGVB were observed by using
conditional logistic regression analysis, although monthly and seasonal
fluctuations were seen in emergency admission for EGVB. The novelty of this
paper was relatively lacking. Here are my questions about this study:
Q1. Would you please show the figure about "flow chart of study design""?
Q2. What's the difference of the methodology "Distributed lag non-linear models
(DLNM)" you used between conventional conditional logistic regression? Why
did you do so? 
Q3. Would you please show demographic data of case and control groups,
including prophylactic's medication for EGVB ? 
Q4. What's the proportional of esophageal variceal bleeding and gastric variceal
bleeding in your study?
Q5. What's the criteria of enrollment of control group in your study?
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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?
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