Reviewer's report 
 Comparison of Morning versus Afternoon Cecal Intubation Rates Title: 
 2  9 April 2007 Version: Date: 
 George Dafnis Reviewer: 
Reviewer's report: 
General 
This is a well written study comprising a large number of colonoscopies. It highlights the importance of 
proper bowel preparation and the impact on completion rates. I have some minor suggestions that I think the authors should address. 
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Major Compulsory Revisions (that the author must respond to before a decision on publication can be reached) 
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Minor Essential Revisions (such as missing labels on figures, or the wrong use of a term, which the author can be trusted to correct) 
1. Regarding presence of diverticulosis and impact on completion rates I think that you should mention that 
you have no reliable data on this in your database and therefore you have not been able to controll for this variable in the logistic regression analysis. 
2. Criteria used to define if the cecum was reached should be stated in the methods section. 
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Discretionary Revisions (which the author can choose to ignore) 
 Accept after minor essential revisions What next?: 
 An article whose findings are important to those with closely related research interests Level of interest: 
 Acceptable Quality of written English: 
 No, the manuscript does not need to be seen by a statistician. Statistical review: 
Declaration of competing interests: 
I declare that I have no competing interests 
Reviewer's report 
 Comparison of Morning versus Afternoon Cecal Intubation Rates Title: 
 2  9 April 2007 Version: Date: 
 George Dafnis Reviewer: 
Reviewer's report: 
General 
This is a well written study comprising a large number of colonoscopies. It highlights the importance of 
proper bowel preparation and the impact on completion rates. I have some minor suggestions that I think the authors should address. 
------------------------------------------------------------------------------- 
Major Compulsory Revisions (that the author must respond to before a decision on publication can be reached) 
------------------------------------------------------------------------------- 
Minor Essential Revisions (such as missing labels on figures, or the wrong use of a term, which the author can be trusted to correct) 
1. Regarding presence of diverticulosis and impact on completion rates I think that you should mention that 
you have no reliable data on this in your database and therefore you have not been able to controll for this variable in the logistic regression analysis. 
2. Criteria used to define if the cecum was reached should be stated in the methods section. 
------------------------------------------------------------------------------- 
Discretionary Revisions (which the author can choose to ignore) 
 Accept after minor essential revisions What next?: 
 An article whose findings are important to those with closely related research interests Level of interest: 
 Acceptable Quality of written English: 
 No, the manuscript does not need to be seen by a statistician. Statistical review: 
Declaration of competing interests: 
I declare that I have no competing interests 
Please review this paper.
user
Reviewer's report 
 Comparison of Morning versus Afternoon Cecal Intubation Rates Title: 
 2  9 April 2007 Version: Date: 
 George Dafnis Reviewer: 
Reviewer's report: 
General 
This is a well written study comprising a large number of colonoscopies. It highlights the importance of 
proper bowel preparation and the impact on completion rates. I have some minor suggestions that I think the authors should address. 
------------------------------------------------------------------------------- 
Major Compulsory Revisions (that the author must respond to before a decision on publication can be reached) 
------------------------------------------------------------------------------- 
Minor Essential Revisions (such as missing labels on figures, or the wrong use of a term, which the author can be trusted to correct) 
1. Regarding presence of diverticulosis and impact on completion rates I think that you should mention that 
you have no reliable data on this in your database and therefore you have not been able to controll for this variable in the logistic regression analysis. 
2. Criteria used to define if the cecum was reached should be stated in the methods section. 
------------------------------------------------------------------------------- 
Discretionary Revisions (which the author can choose to ignore) 
 Accept after minor essential revisions What next?: 
 An article whose findings are important to those with closely related research interests Level of interest: 
 Acceptable Quality of written English: 
 No, the manuscript does not need to be seen by a statistician. Statistical review: 
Declaration of competing interests: 
I declare that I have no competing interests 
assistant