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Parity influences the severity of ACPA-negative early rheumatoid arthritis: a cohort study based on the Swedish EIRA material
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Centrum för klinisk forskning i Sörmland (CKFD). Malarsjukhuset Hosp, Rheumatol Unit, Eskilstuna, Sweden.;Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden.; Lund Univ, Dept Clin Sci, Rheumatol, Malmo, Sweden..
Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden..
Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Medicinska och farmaceutiska vetenskapsområdet, centrumbildningar mm, Centrum för klinisk forskning i Sörmland (CKFD).
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2015 (English)In: Arthritis Research & Therapy, ISSN 1478-6354, E-ISSN 1478-6362, Vol. 17, 358Article in journal (Refereed) Published
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Abstract [en]

Background: In women with rheumatoid arthritis (RA) it has been observed that during pregnancy a majority of patients experience amelioration, but after delivery a relapse of the disease is common. However, there are few studies, with diverging results, addressing the effect of parity on the severity of RA over time. Our aim was to explore the impact of parity, with stratification for anti-citrullinated protein antibody (ACPA) status as well as for onset during reproductive age or not. Methods: Female RA cases aged 18-70 years were recruited for the Epidemiological Investigation of Rheumatoid Arthritis (EIRA). Information on disease severity (the health assessment questionnaire (HAQ) and the disease activity score 28 (DAS28)) was retrieved from the Swedish Rheumatology Quality Register at inclusion and 3, 6, 12 and 24 months after diagnosis. Mixed models were used to compare mean DAS28 and HAQ scores over time in parous and nulliparous women. Mean differences at individual follow-up visits were compared using analysis of covariance. The odds of having DAS28 or HAQ above the median in parous verus nulliparous women were estimated in logistic regression models. Results: A total of 1237 female cases (mean age 51 years, 65 % ACPA-positive) were included. ACPA-negative parous women, aged 18-44 years, had on average 1.17 units higher DAS28 (p < 0.001) and 0.43 units higher HAQ score (p < 0.001) compared to nulliparous women during the follow-up time, adjusted for age. In this subgroup, the average DAS28 and HAQ scores were significantly higher in parous women at all follow-up time points. Younger parous ACPA-negative women were significantly more likely to have DAS28 and HAQ values above the median compared to nulliparous women at all follow-up visits. No association between parity and severity of ACPA-positive disease was observed. Conclusions: Parity was a predictor of a more severe RA among ACPA-negative younger women, which might indicate that immunomodulatory changes during and after pregnancy affect RA severity, in particular for the ACPA-negative RA phenotype.

Place, publisher, year, edition, pages
2015. Vol. 17, 358
Keyword [en]
Rheumatoid arthritis, Parity, Clinical outcome, Epidemiology, Hormonal factors
National Category
Rheumatology and Autoimmunity
Identifiers
URN: urn:nbn:se:uu:diva-272060DOI: 10.1186/s13075-015-0869-xISI: 000366360600001PubMedID: 26653988OAI: oai:DiVA.org:uu-272060DiVA: diva2:893211
Funder
Swedish Rheumatism AssociationStockholm County CouncilNIH (National Institute of Health)
Available from: 2016-01-12 Created: 2016-01-11 Last updated: 2017-11-30Bibliographically approved

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Pikwer, Andreas

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