Table 3.

Standardized Incidence Rate Ratio by Ethnicity and IBD Type

	Inflammatory Bowel Disease		Crohn's Disease		Ulcerative Colitis
	Crude IRR (95% CI)	Standardized IRR (95% CI)	Crude IRR (95% CI)	Standardized IRR (95% CI)	Crude IRR (95% CI)	Standardized IRR (95% CI)
South Asian vs general	0.69 (0.66–0.73)	0.59 (0.55–0.63)	0.46 (0.42–0.49)	0.41 (0.36–0.45)	0.91 (0.86–0.97)	0.74 (0.69–0.80)
Chinese vs general	0.21 (0.19–0.24)	0.22 (0.19–0.24)	0.15 (0.12–0.17)	0.15 (0.12–0.18)	0.28 (0.25–0.32)	0.28 (0.24–0.32)
South Asian vs Chinese	3.24 (2.92–3.60)	2.72 (2.40–3.09)	3.10 (2.58–3.74)	2.71 (2.15–3.41)	3.24 (2.84–3.69)	2.70 (2.31–3.15)

Notes: General the comparative reference population cohort.

Abbreviation: IRR, incidence rate ratio.