Rheumatoid arthritis and birth outcomes: a Danish and Swedish nationwide prevalence study

. Nørgaard M, Larsson H, Pedersen L, Granath F, Askling J, Kieler H, Ekbom A, Sørensen HT, Stephansson O (Aarhus University Hospital, Denmark, Karolinska Institutet; Karolinska University Hospital, Solna; and Karolinska Institutet, Solna; Stockholm, Sweden). Rheumatoid arthritis and birth outcomes: a Danish and Swedish nationwide prevalence study. J Intern Med 2010; 268: 329–337. Objectives. To examine the prevalence of preterm birth, infants with low Apgar score, small for gestational age (SGA) birth, stillbirth and congenital abnormalities in women with rheumatoid arthritis (RA) compared with women without RA. Design. Prevalence study. Setting. Combined Sweden and Denmark nationwide from 1994 to 2006. Subjects. We included 871 579 women with a first‐time singleton birth identified through population‐based healthcare databases. Main outcome measures. We compared the prevalence of preterm birth, low Apgar score (