{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,5]],"date-time":"2026-11-05T05:54:30Z","timestamp":1793858070418,"version":"4.6.1"},"reference-count":42,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2007,7,30]],"date-time":"2007-07-30T00:00:00Z","timestamp":1185753600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Arthritis &amp; Rheumatism"],"published-print":{"date-parts":[[2007,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To evaluate whether seasonal early environmental exposures might influence later development of autoimmune disease, by assessing distributions of birth dates in groups of patients with idiopathic inflammatory myopathies (IIMs).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We assessed birth patterns in groups of patients with juvenile\u2010onset IIM (n = 307) and controls (n = 3,942) who were born between 1970 and 1999, and in groups of patients with adult\u2010onset IIM (n = 668) and controls (n = 6,991) who were born between 1903 and 1982. Birth dates were analyzed as circular data. Seasonal clustering was assessed by the Rayleigh test, and differences between groups by a rank\u2010based uniform scores test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The overall birth distributions among patients with juvenile IIM and among patients with adult IIM did not differ significantly from those among juvenile and adult controls, respectively. Some subgroups of patients with juvenile IIM had seasonal birth distributions. Hispanic patients with juvenile\u2010onset IIM had a seasonal birth pattern (mean birth date October 16) significantly different from that of Hispanic controls (<jats:italic>P<\/jats:italic> = 0.002), who had a uniform birth distribution, and from that of non\u2010Hispanic patients with juvenile\u2010onset IIM (<jats:italic>P<\/jats:italic> &lt; 0.001), who had a mean birth date of May 2. Juvenile dermatomyositis patients with p155 autoantibody had a birth distribution that differed significantly from that of p155 antibody\u2013negative juvenile dermatomyositis patients (<jats:italic>P<\/jats:italic> = 0.003). Juvenile IIM patients with the HLA risk factor allele DRB1*0301 had a birth distribution significantly different from those without the allele (<jats:italic>P<\/jats:italic> = 0.021). Similar results were observed for juvenile and adult IIM patients with the linked allele DQA1*0501, versus juvenile and adult IIM patients without DQA1*0501, respectively. No significant patterns in birth season were found in other subgroups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Birth distributions appear to have stronger seasonality in juvenile than in adult IIM subgroups, suggesting greater influence of perinatal exposures on childhood\u2010onset illness. Seasonal early\u2010life exposures may influence the onset of some autoimmune diseases later in life.<\/jats:p><\/jats:sec>","DOI":"10.1002\/art.22751","type":"journal-article","created":{"date-parts":[[2007,7,30]],"date-time":"2007-07-30T16:18:42Z","timestamp":1185812322000},"page":"2719-2728","source":"Crossref","is-referenced-by-count":58,"title":["Seasonal birth patterns in myositis subgroups suggest an etiologic role of early environmental exposures"],"prefix":"10.1002","volume":"56","author":[{"given":"Leora J.","family":"Vegosen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Clarice R.","family":"Weinberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Terrance P.","family":"O'Hanlon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ira 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