Review for 10.1186/s12876-020-01527-1 (2020)

Reviewer’s report
Title: 
Increasing newly diagnosed inflammatory bowel disease and improving
prognosis in China: a 30-year retrospective study from a single center
Version: 
0 
Date: 
04 Sep 2020
Reviewer's report:
This retrospective study characterizes the trends of prognosis in Ulcerative
Colitis (UC) and Crohn's Disease (CD) during the past 30 years in a tertiary
Chinese hospital. The study design and analysis of the study are well structured. 
Minor comments are as follows:
1) The article needs to be reviewed by a native-English speaker for both
grammar and spelling mistakes before publishing. Many mistakes throughout the
whole article can be spotted and must be corrected. 
2) The ICD 9 (555) and ICD10 (K50) codes are repeated for both UC and CD
and should be corrected (under the section for Methods-Patients).
3) The last sentence under Results, the section for ''Complication of IBD'' has a
repeated word for CD and CD (line 15), I suppose the authors meant UC and
CD. Please correct it. 
4) The phrase ''sepsis shock'', should be corrected to ''septic shock'' in several
locations throughout the manuscript to preserve consistency. 
5) The forth paragraph under discussion, mentioning the study by Christopher,
should be consistent with reference 13 (Ma et.al) and not Cristopher. Also add
et.al. 
6) The word cases must be replaced by ''n='' in italic form. The letters ''P'' in P-
values and ''t'' in Student t test, should be in italic form. 
7) Table 2 must include n(%) in the text. 
8) Tables 3 and 4, must include the explanation of the abbreviations B, SE and
WLAD as a foot note.
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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?
Yes
Are the methods sufficiently described to allow the study to be repeated?
Yes
Is the use of statistics and treatment of uncertainties appropriate?
Yes
Is the presentation of the work clear?
Yes
Are the images in this manuscript (including electrophoretic gels and blots) free
from apparent manipulation?
Yes