{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T12:44:55Z","timestamp":1782996295009,"version":"3.54.5"},"reference-count":21,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2012,5,10]],"date-time":"2012-05-10T00:00:00Z","timestamp":1336608000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Muscle and Nerve"],"published-print":{"date-parts":[[2012,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction:<\/jats:title><jats:p>To assess age\u2010 and sex\u2010specific myasthenia gravis (MG) occurrence and incidence in the different geographical regions in Norway and thereby to identify factors that may contribute to the development of MG.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods:<\/jats:title><jats:p>Multiple Poisson regression analysis was used to assess variation in incidence dependent on year, gender and onset age in five geographically defined health regions.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>The study population comprised 419 individuals with first time seropositive tests from 1995 to 2007. Annual MG incidence ranged from &lt; 1 to 14 per million, with an average of 7.04 per million for all five health regions combined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions:<\/jats:title><jats:p>This is the first nation\u2010wide epidemiological study of seropositive MG that elucidates the geographical differences within a country. The incidence of seropositive MG did not vary significantly between the regions. Mid\u2010Norway tended to have a higher incidence, and North tended to have a lower incidence. 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