Reviewer’s report
Title: Development and Internal Validation of a Nomogram for Preoperative Prediction of
Surgical Treatment Effect on Cesarean Section Diverticulum
Version: 0 Date: 18 Feb 2019
Reviewer: Ilaria Fantasia
Reviewer's report:
–no information about type of uterine suture used in the study population was given. It could be  
interesting to know if the art of the uterine suture influences niche's severity...
–what was the incidence of niche referred to the number of C-section? how long after the c-
section did patients underwent surgery?
–what was the incidence of the requiring surgery niche patients?
–if you  selected your study population  only prior to  niche's  surgical correction,  you  could  
undergo selection bias! (you selected only patients, that came to the hospital because they had  
pain or vag. bleeding, but you have no information about the entity of the niche of those  
patients, who didn't go to the hospital)
–what about patients, who undergone more than two c-section?
–the concrete clinical use of the nomogram is not clear
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.
Unable to assess
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:
Acceptable
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