TABLE 3.

RR of CP in Offspring by Number of Maternal Chronic Conditions in the Medical Birth Registry of Norway

Maternal Condition	Exposed No.	Exposed With CP No. (per 1000)	aRR (95% CI)
No autoimmune conditiona,b	1 328 494	3459 (2.6)	Reference
1 autoimmune conditiona,b	30 809	111 (3.6)	1.4 (1.1–1.7)
>1 autoimmune conditiona,b	846	5 (5.9)	2.7 (1.1–6.6)
No conditionsc	1 222 386	3143 (2.6)	Reference
1 conditionc	128 390	394 (3.1)	1.2 (1.1–1.4)
2 conditionsc	9054	33 (3.6)	1.6 (1.1–2.2)
>2 conditionsc	751	5 (6.7)	3.1 (1.4–6.8)

All analyses are adjusted for year of birth. aRR, adjusted relative risk.

^aData available for 1999–2012.

^bChildren of mothers with none, 1, or >1 autoimmune condition listed in Table 2.

^cChildren of mothers with none, 1, 2, or >2 of the conditions listed in Table 2.