Review for 10.1186/s12876-018-0876-x (2018)

Reviewer ’s report  
 
Title:  Prevalence and risk factors for hypokalemia in patients scheduled for laparoscopic 
colorectal resection and its association with p ost-operative recovery  
 
Version: 1 Date: 03 Jul 2018 
 
Reviewer:  Okello  Samson  
 
Reviewer’s report:  
 
Qianqian Zhu, et al. evaluated the prevalence of hypokalemia in patients scheduled for 
laparoscopic colorectal resection and analysis of related factors using a retrospective review of 
charts of patients scheduled for laparoscopic col orectal resection over 2 years in at the Third 
Affiliated Hospital of Sun Yat -sen University, China  
 
 
Comments:  
 
1. The typesetting should be redone to avoid joining of words thus creating long nonsensical 
words.  
 
2. The authors should explain how the select ed patients records were sampled from the pool of 
eligible files  
 
3. How many files were excluded and what were the reasons for exclusion?  
 
4. It is statistically improbable to end up with incidence rates from logistic regression. Please 
elaborate  
 
5. Discuss ion should place the major findings into perspective of current literature in the subject 
and not reiterate the results  
 
6. A section/paragraph of limitations would be helpful  
 
Are the methods appropriate and well described?  
If not, please specify what is required in your comments to the authors.  
 
No 
 
Does the work include the necessary controls?  
If not, please specify which controls are required in your comments to the authors.  
 
No 
 
Are the conclusions drawn adequately supported by the data shown?  
If not, please explain in your comments to the authors.  
 
No 
 
Are you able to assess any statistics in the manuscript or would you recommend an 
additional statistical review?  
If an additional statistical review is recommended, please specify what aspects require further 
assessment in your comments to the editors.  
 
I recommend additional statistical review  
 
Quality of written English  
Please indicate the quality of language in the manuscript:  
 
Not suitable for publicatio n unless extensively edited  
 
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 publication of this 
manuscript, either now or in the future?  
 
2. Do you hold any stocks or shares in an organisation that may in any w ay gain or lose 
financially from the publication of this manuscript, either now or in the future?  
 
3. Do you hold or are you currently 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 ans wer 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.  
 
I agree to the open peer review policy of the journal. I understand that my name will be included 
on my report to the authors and, if the manuscript is accepted for publication, my named report 
including any attachments I upload will be posted on the website along with the authors' 
responses. I agree for my repo rt to be made available under an Open Access Creative Commons 
CC-BY license ( http://creativecommons.org/licenses/by/4.0/ ). I understand that any comments 
which I do not wish to be included in my named report can be included as confidential comments 
to the editors, which will not be published.  
 
I agree to the open peer review policy of the journal