Table 1.

Termination of pregnancy and sterilisation in women with and without type 1 diabetes

Variable	Termination of pregnancy		Sterilisation
	T1D	Non-T1D	T1D	Non-T1D
Number of:
Women at risk	1123	2905	2281	4509
Procedures	344	722	597	873
Births	1673	5535
Person-years	1243	4317	41,308	92,328
Ratea,b	277a	167a	14.5b	9.5b
SIRc (95% CI)	1.67 (1.51, 1.86)	Ref.	1.69 (1.56, 1.83)	Ref.

The control group are women without type 1 diabetes

^aTerminations of pregnancy per 1000 pregnancy-years

^bSterilisation procedures per 1000 person-years

^cEstimated by comparing age-period specific rates in women with type 1 diabetes with the comparable rates in the control group (reference group)

Ref., reference; T1D, type 1 diabetes