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Parity influences t...
Parity influences the severity of ACPA-negative early rheumatoid arthritis : a cohort study based on the Swedish EIRA material
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- Pikwer, Mitra (author)
- Lund University,Lunds universitet,Uppsala universitet,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.,Internmedicin - epidemiologi,Forskargrupper vid Lunds universitet,Internal Medicine - Epidemiology,Lund University Research Groups
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- Orellana, Cecilia (author)
- Karolinska Institutet,Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden.
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- Kallberg, Henrik (author)
- Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden.
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- Pikwer, Andreas (author)
- Uppsala universitet,Centrum för klinisk forskning i Sörmland (CKFD)
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- Turesson, Carl (author)
- Lund University,Lunds universitet,Internmedicin - epidemiologi,Forskargrupper vid Lunds universitet,Internal Medicine - Epidemiology,Lund University Research Groups,Lund Univ, Dept Clin Sci, Rheumatol, Malmo, Sweden.
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- Klareskog, Lars (author)
- Karolinska Institutet,Karolinska Inst, Rheumatol Unit, Dept Med, Stockholm, Sweden.;Karolinska Univ Hosp Solna, Stockholm, Sweden.
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- Alfredsson, Lars (author)
- Karolinska Institutet,Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden.;Stockholm Cty Council, Ctr Occupat & Environm Med, Stockholm, Sweden.
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- Saevarsdottir, Saedis (author)
- Karolinska Institutet,Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden.;Karolinska Inst, Rheumatol Unit, Dept Med, Stockholm, Sweden.;Karolinska Univ Hosp Solna, Stockholm, Sweden.
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- Bengtsson, Camilla (author)
- Karolinska Institutet,Karolinska Inst, Inst Environm Med, S-10401 Stockholm, Sweden.
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(creator_code:org_t)
- 2015-12-12
- 2015
- English.
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In: Arthritis Research & Therapy. - : Springer Science and Business Media LLC. - 1478-6362 .- 1478-6354. ; 17
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Abstract
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- 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.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Reumatologi och inflammation (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Rheumatology and Autoimmunity (hsv//eng)
Keyword
- Rheumatoid arthritis
- Parity
- Clinical outcome
- Epidemiology
- Hormonal factors
Publication and Content Type
- ref (subject category)
- art (subject category)
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