Table 3.

Relationship between normal and low serum retinol levels and negative and positive relative dose response test results in Crohn's disease patients and controls

Serum retinol levels	RDR test
	Negative		Positive
	CD	CT	CD	CT
Normal	22	28	5	0
Low	2	1	9	4
Total	24	29	14	4

CT: Controls; CD: Crohn's disease; RDR: Relative dose response.