Impact of vitamin D on the hospitalization rate of Crohn's disease patients seen at a tertiary care center

Table 2 Crude, partially adjusted, fully adjusted rate ratios for Crohn’s disease- related hospitalization

	CD-related number of hospitalizations/total person years	Hospitalization rate (95%CI)1	IRR (95%CI)
			Model 1	Model 2	Model 3
Overall	372/1610	23.11 (20.87, 25.58)
Mean Vitamin D level ≥ 30 mg/dL	101/712	14.19 (11.67, 17.24)	1 (reference)	1 (reference)	1 (reference)
Mean Vitamin D level < 30 mg/dL	271/898	30.18 (26.79, 33.99)	2.13(1.69, 2.67)	1.76 (1.38, 2.24)	1.44 (1.11, 1.87)

¹Per 100 person-year. Model 1 is unadjusted; Model 2 is partially adjusted for age, sex, race, duration of disease; Model 3 is fully adjusted for age, sex, race, duration of disease, BMI, smoking, steroids, traditional and biological, immune modulators, thiopurines, methotrexate. CD: Crohn’s disease; BMI: Body mass index.