Prior Appendectomy and the Onset and Course of Crohn’s Disease in Chinese Patients

Table 4

The distribution of CD patients about age of appendectomy and interval between appendectomy and diagnosis of CD.

	Interval between appendectomy and diagnosis of CD (years)
	0–1	2–5	>5
Age of appendectomy (year) in CD
≤20	2	1	17
>20	4	6	11
Total	6	7	28
Age of appendectomy (year) in controls
≤20	0	2	8
>20	0	0	13
Total	0	2	21