Smokers with Multiple Sclerosis Are More Likely to Report Comorbid Autoimmune Diseases

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Abstract

Background/Aims: Smoking is a risk factor for multiple sclerosis (MS) and autoimmune disease, and might explain an increased risk of comorbid autoimmune disease (CAD) in MS. We compared the risk of CAD in smokers and nonsmokers with MS. Methods: Participants enrolled in the North American Research Committee on Multiple Sclerosis Registry reported their smoking status, the presence of CAD and the year of diagnosis. We used multivariable logistic regression to determine the independent association between smoking and CAD. We also compared the risk of developing a CAD in current smokers versus never-smokers who did not report any CAD at MS onset, using a proportional hazards model. Results: Among 8,875 participants reporting comorbidities and smoking status, 1,649 (18.5%) reported a CAD. In a multivariable logistic model, ever-smokers had increased odds of reporting a CAD (odds ratio: 1.22; 95% CI: 1.08–1.38). Among the 7,830 participants without a CAD at onset of MS who reported their smoking status, including the age at which they started smoking, 3,035 (36.8%) currently smoked, while 3,805 (48.6%) never smoked. After adjustment, smokers had an increased risk of developing any autoimmune disease (hazard ratio: 1.23; 95% CI: 1.08–1.41) after MS onset. Conclusion: Smoking is associated with an increased risk of CAD in MS.

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Agreement between self-report questionnaires and medical record data was substantial for diabetes, hypertension, myocardial infarction and stroke but not for heart failure.

Yuji Okura, Lynn H. Urban, Douglas Mahoney … (2004)

Questionnaires are used to estimate disease burden. Agreement between questionnaire responses and a criterion standard is important for optimal disease prevalence estimates. We measured the agreement between self-reported disease and medical record diagnosis of disease. A total of 2,037 Olmsted County, Minnesota residents > or =45 years of age were randomly selected. Questionnaires asked if subjects had ever had heart failure, diabetes, hypertension, myocardial infarction (MI), or stroke. Medical records were abstracted. Self-report of disease showed >90% specificity for all these diseases, but sensitivity was low for heart failure (69%) and diabetes (66%). Agreement between self-report and medical record was substantial (kappa 0.71-0.80) for diabetes, hypertension, MI, and stroke but not for heart failure (kappa 0.46). Factors associated with high total agreement by multivariate analysis were age 12 years, and zero Charlson Index score (P < .05). Questionnaire data are of greatest value in life-threatening, acute-onset diseases (e.g., MI and stroke) and chronic disorders requiring ongoing management (e.g.,diabetes and hypertension). They are more accurate in young women and better-educated subjects.

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The prevalence and geographic distribution of Crohn's disease and ulcerative colitis in the United States.

Michael D. Kappelman, Sheryl L. Rifas-Shiman, Ken Kleinman … (2007)

Previous US studies of inflammatory bowel disease (IBD) prevalence have sampled small, geographically restricted populations and may not be generalizable to the entire nation. This study sought to determine the prevalence of Crohn's disease (CD) and ulcerative colitis (UC) in a large national sample and to compare the prevalence across geographic regions and other sociodemographic characteristics. We analyzed the health insurance claims for 9 million Americans, pooled from 87 health plans in 33 states, and identified cases of CD and UC using diagnosis codes. Prevalence was determined by dividing the number of cases by the number of persons enrolled for 2 years. Logistic regression was used to compare prevalence estimates by geographic region, age, sex, and insurance type (Medicaid vs commercial). The prevalence of CD and UC in children younger than 20 years was 43 (95% confidence interval [CI], 40-45) and 28 (95% CI, 26-30) per 100,000, respectively. In adults, the prevalence of CD and UC was 201 (95% CI, 197-204) and 238 (95% CI, 234-241), respectively. The prevalence of both conditions was lower in the South, compared with the Northeast, Midwest, and West. IBD appears to be more common in commercially insured individuals, compared with those insured by Medicaid. This estimation of the prevalence of IBD in the US should help quantify the overall burden of disease and inform the planning of appropriate clinical services.

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Incidence and prevalence of uveitis in Northern California; the Northern California Epidemiology of Uveitis Study.

David C. Gritz, Ira G. Wong (2004)

To determine the incidence and prevalence of uveitis in a large, well-defined population in Northern California. Cross-sectional study using retrospective database and medical record review. A group of 2070 people within 6 Northern California medical center communities (N = 731 898) who had a potential diagnosis of uveitis. The patient database of a large health maintenance organization (2 805 443 members at time of the study) was searched for all patients who, during a 12-month period, had the potential diagnosis of uveitis. Detailed quarterly gender- and age-stratified population data were available. Medical records of patients who potentially had uveitis and who were members of the 6 target communities were reviewed by 2 uveitis subspecialists to confirm the diagnosis of uveitis and to establish time of onset. Demographic and clinical data were gathered for patients meeting the clinical definition of uveitis. Incidence rates were calculated by using a dynamic population model. Prevalence rates were based on the mid-study period population. Presence and date of onset of uveitis. At midstudy, the population for the 6 communities was 731 898. During the target period, 382 new cases of uveitis were diagnosed; 462 cases of uveitis were diagnosed before the target period. These data yielded an incidence of 52.4/100 000 person-years and a period prevalence of 115.3/100 000 persons. The incidence and prevalence of disease were lowest in pediatric age groups and were highest in patients 65 years or older (P<0.0001). The prevalence of uveitis was higher in women than in men (P<0.001), but the difference in incidence between men and women was not statistically significant. Comparison between the group of patients who had onset of uveitis before the target period (ongoing uveitis) and the entire cohort of uveitis patients showed that women had a higher prevalence of ongoing uveitis than men and that this difference was largest in the older age groups (P<0.001). In this largest population-based uveitis study in the United States to date, the incidence of uveitis was approximately 3 times that of previous U.S. estimates and increased with the increasing age of patients. Women had a higher prevalence of uveitis than men, and the largest differences were in older age groups.

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Author and article information

Journal

Journal ID (publisher-id): NED

Journal ID (nlm-ta): Neuroepidemiology

Journal ID (doi): 10.1159/issn.0251-5350

Title: Neuroepidemiology

Publisher: S. Karger AG

ISSN (Print): 0251-5350

ISSN (Electronic): 1423-0208

Publication date Subscription-year: 2011

Publication date (Print): April 2011

Publication date (Electronic): 01 February 2011

Volume: 36

Issue: 2

Pages: 85-90

Affiliations

^aDepartment of Internal Medicine, University of Manitoba, Winnipeg, Man., Canada; ^bDepartment of Medicine, Stanford University, Stanford, Calif., ^cDepartment of Biostatistics, University of Alabama at Birmingham, Birmingham, Ala., and ^dDivision of Neurology, Barrow Neurological Institute, Phoenix, Ariz., USA

Author notes

*Ruth Ann Marrie, MD, PhD, Health Sciences Center, GF 543, 820 Sherbrook Street, Winnipeg, MB R3A 1R9 (Canada), Tel. +1 204 787 4951, Fax +1 204 787 1486, E-Mail rmarrie@hsc.mb.ca

Article

Publisher ID: 323948 Pmcid ID: PMC3047764 Other ID: Neuroepidemiology 2011;36:85–90

DOI: 10.1159/000323948

PMC ID: PMC3047764

PubMed ID: 21282965

SO-VID: 052e56cb-e17a-4cb0-a94b-be7584158d03

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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.

History

Date received : 12 August 2010

Date accepted : 21 December 2010

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Tables: 4, Pages: 6

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Smokers with Multiple Sclerosis Are More Likely to Report Comorbid Autoimmune Diseases

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Karger: Neurology and Neuroscience

Most cited references 19

Agreement between self-report questionnaires and medical record data was substantial for diabetes, hypertension, myocardial infarction and stroke but not for heart failure.

The prevalence and geographic distribution of Crohn's disease and ulcerative colitis in the United States.

Incidence and prevalence of uveitis in Northern California; the Northern California Epidemiology of Uveitis Study.

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