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Correlation between Crohn’s disease and ulcerative colitis in the annual numbers of new cases (A) and the annual numbers of cases (B).
In Japan, national registration of ulcerative colitis and Crohn’s disease started in 1975 and 1976, respectively. A scattergram was generated based on the data for 24 years from 1977 to 2000 (29), (30), (31). The linear regression formula and correlation coefficient are shown.
