Table I. Characteristics of pregnancies included in the study.

ACPA, anti-citrullinated protein antibody; RU, rheumatoid factor.

	Pregnancies
	Control (n = 32)	RA (n = 36)
Age at delivery in years, mean (S.D.)	32.1 (4.4)	32.5 (4.0)
Duration of pregnancy in weeks, mean (S.D.)	40.1 (1.4)	39.2 (1.9)
Disease duration at first visit in years, mean (S.D.)	–	7.3 (5.8)
ACPA positive patients, n (%)	–	22 (61%)
RF positive patients, n (%)	–	25 (69.4%)
Erosive disease, n (%)	–	14 (38.9%)
Disease activity score (DAS28(3)-CRP) at preconception, mean (S.D.)	–	3.8 (1.0)