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Prevalence and Incidence of Epilepsy in an Elderly and Low-Income Population in the United States
Derek H. Tang,Daniel C. Malone,Terri L. Warholak,Jenny Chong,Edward P. Armstrong,Marion K. Slack,Chiu-Hsieh Hsu,David M. Labiner 대한신경과학회 2015 Journal of Clinical Neurology Vol.11 No.3
Background and Purpose Te purpose of this study was to estimate the incidence and prevalence of epilepsy among an elderly and poor population in the United States. Methods Arizona Medicaid claims data from January 1, 2008 to December 31, 2010 were used for this analysis. Subjects who were aged ≥65 years and were continuously enrolled in any Arizona Medicaid health plans (eligible to patients with low income) for ≥12 months between January 1, 2008 and December 31, 2009 were considered eligible for inclusion in the study cohort. In addition to meeting the aforementioned criteria, incident and prevalent cases must have had epilepsy-related healthcare claims. Furthermore, incident cases were required to have a 1-year “clean” period immediately preceding the index date. Negative binomial and logistic regression models were used to assess the factors associated with epilepsy incidence and prevalence. Results Te estimated epilepsy incidence and prevalence for this population in 2009 were 7.9 and 19.3 per 1,000 person-years, respectively. Te incidence and prevalence rates were signifcantly higher for patients with comorbid conditions that were potential risk factors for epilepsy and were of younger age than for their non-comorbid and older counterparts (p<0.05). Te prevalence rates were signifcantly higher for non-Hispanic Blacks and male benefciaries than for non-Hispanic Whites and female benefciaries, respectively (p<0.05). Conclusions Tis patient population had higher epilepsy incidence and prevalence compared with the general US population. Tese diferences may be at least in part attributable to their low socioeconomic status.