The prevalence ratio per 100,000 population of each disease was multiple sclerosis (MS) 1.3, myasthenia gravis (MG) 6.7, and polymyositis (PM) 5.0 in Kumamoto city, Japan (population 0.56 million, and the survey date on June 30, 1982). The prevalence ratio of MS was similar to that of 25 years ago in Kumamoto city. The incidence of MS had been stable despite Westernization of life-style in Japan. The prevalence ratio of MG and PM had increased moderately, possibly due to prolongation of life with recent progress in therapy. The prevalence ratio of all types of myopathies in Kumamoto prefecture (population: 1.8 million) on July 31, 1983, was estimated as approximately 17.4 per 100,000, for progressive muscular dystrophy (PMD) 4.1 per 100,000 population, compared to 3.9 for MG, and 2.4 for PM. The relative frequency of PMD, MG and PM was 23.3, 22.0 and 13.9%, respectively. The data shows that the prevalence ratio of various myopathies has not changed over the last 20 years in selected cities of Japan but the relative frequency of the diseases have changed due to recognition of the disease and prolongation of long life due to developments in diagnosis and treatment.

Keywords:
Multiple sclerosis, Myasthenia gravis, Polymyositis, Progressive muscular dystrophy, Prevalence studies
This content is only available via PDF.
© 1987 S. Karger AG, Basel
1987
Copyright / Drug Dosage / Disclaimer
Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.
You do not currently have access to this content.