ArticlePloS one2025
Real-world trends in rheumatic disease rates among pregnancies in Ontario, Canada: A repeated cross-sectional study.
Article in PloS one, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveDespite increasing rheumatic disease prevalence among female individuals in Ontario, Canada, research is limited on whether this has translated to an increased proportion of pregnancies with rheumatic diseases. This study aimed to assess rheumatic disease rates among pregnant individuals in Ontario, Canada.
methodsUsing healthcare administrative claims databases from ICES, the proportion of pregnancies with rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), psoriatic arthritis (PsA), and ankylosing spondylitis (AS) from April 2011 to March 2021 were examined. The Mann-Kendall rank correlation test was used to test for trends in overall and individual rheumatic disease rates across the study period.
resultsIn total, 1,408,100 pregnancies were recorded from fiscal years 2011-2020 in Ontario. Of these, 4,392 involved patients with rheumatic diseases. The overall rheumatic disease rate among pregnant individuals increased by 24% from 28.3 to 35.2 pregnancies per 10,000 over the study period (p = 0.0157). RA rates increased 22% from 11.1 to 13.5 per 10,000 (p = 0.0056), while PsA rates increased 111% from 0.9 to 1.9 per 10,000 (p = 0.0157). SLE, AS, and multiple rheumatic disease rates did not increase significantly.
conclusionThe proportion of individuals with rheumatic diseases pursuing pregnancy in Ontario has increased, perhaps aided by advancements in disease diagnostics and treatment strategies. Further research is needed to link antirheumatic drug safety to pregnancy outcomes and explore other factors that may influence pregnancy rates among this patient population.
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