Review for 10.1186/s12876-020-01220-3 (2020)

Reviewer ’s report  
 
Title: Effectiveness of concomitant use of green tea and polyethyl ene glycol in bowel 
preparation for colonoscopy: A randomized control led study  
 
Version: 0 Date: 22 Sep 2019  
 
Reviewer: Liaonan Zou  
 
Reviewer's report:  
The manuscript is a well -designed, prospect ive, randomized controlled study. The bad taste of 
bowel preparation drugs is indeed a clinical problem.  
This study evaluates the effectiveness and safety of the Polyethylene glycol solution (PEG) and 
PEG+GT(green tea) in bowel preparation prior to colonos copy,  
suggesting that in the bowel preparation, patients with PEG+GT have better tolerance and better 
colonoscopy experience( higher rate of patients who administered full dose of allocated solution
，more tolerance indicators ，more willingness to repeat colo noscopy, less adverse reactions 
such as nausea, vomit and abdominal pain)  
This is a very amazing and interesting research topic!  
It would be better if the article talked more about why tea was chosen as a research topic （tea 
with the largest number of peopl e drinking in the world? ）,If only to improve the taste, why not 
choose coffee, ,Coca Cola ,or even beer?  
 
 
Are the methods appropriate and well described?  
If not, please specif y what is required in your comments to the authors.  
 
Yes 
 
Does the work include the necessary controls?  
If not, please specify which controls are required in your comments to the authors.  
 
Yes 
 
Are the conclusions drawn adequately supported by the  data shown?  
If not, please explain in your comments to the authors.  
 
Yes 
 
Are you able to assess any statistics in the manus cript or would you recommend an 
additional statistical review?  
If an additional statistical review is recommended, pleas e speci fy what aspects require further 
assessment in your comments to the editors.  
 
I am able to assess the statistics  
 
Quality of written English  
Please indicate the quality of language in the manuscript:  
 
Acceptable  
 
Declaration of competing interests  
Please complete a declaration of competing interests, considering the following questions:  
 
1. Have you in the past five years received reimbursements, fees, funding, or salary from an  
organisation that may in any way gain or lose financially from the publi cation of this  
manuscript, either now or in the future?  
 
2. Do you hold any stocks or shares in an organisation t hat may in any way gain or lose 
financially from the publication of this manuscript, either now or in the future?  
 
3. Do you hold or are you curr ently applying for any patents  relating to the content of the 
manuscript?  
 
4. Have you received reimbursements, fees, funding, or salary from an organization that 
holds  or has applied for patents relating to the content of the manuscript?  
 
5. Do you have any  other financial competing interests?  
 
6. Do you have any non -financial competing interests in relation to this paper?  
 
If you can answer no to all of the above, write 'I declare that I have  no competing interests' 
below. If your reply is yes to any, please give details below.  
 
I declare that I have no competing interests.  
 
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