Figure 1.
The flow chart of case capture.
The flow chart described the procedure of case capture. Firstly, any patients with suspected or diagnosed IBD were checked medical history and investigations and then were follow-up for 3 months. Then expert team including IBD specialists and pathology experts determined the diagnosis. Finally, a retrospective search was performed to avoid missing cases.
Table 1.
Demographic characteristics of new cases with IBD in North of China.
Table 2.
Crude incidence rate (per 100,000) of IBD overall, CD, and UC in North of China.
Table 3.
Age-standardized incidence rate (per 100,000) of IBD overall, CD, and UC in North of China.
Table 4.
Clinical characteristics of new cases of IBD in North of China.