Defining incident cases of epilepsy in administrative data.

Abstract:

PURPOSE:To determine the minimum enrollment duration for identifying incident cases of epilepsy in administrative data. METHODS:We performed a retrospective dynamic cohort study using Ohio Medicaid data from 1992 to 2006 to identify a total of 5037 incident epilepsy cases who had at least 1 year of follow-up prior to epilepsy diagnosis (epilepsy-free interval). The incidence for epilepsy-free intervals from 1 to 8 years, overall and stratified by pre-existing disability status, was examined. The graphical approach between the slopes of incidence estimates and the epilepsy-free intervals was used to identify the minimum epilepsy-free interval that minimized misclassification of prevalent as incident epilepsy cases. RESULTS:As the length of epilepsy-free interval increased, the incidence rates decreased. A graphical plot showed that the decline in incidence of epilepsy became nearly flat beyond the third epilepsy-free interval. CONCLUSION:The minimum of 3-year epilepsy-free interval is needed to differentiate incident from prevalent cases in administrative data. Shorter or longer epilepsy-free intervals could result in over- or under-estimation of epilepsy incidence.

journal_name

Epilepsy Res

journal_title

Epilepsy research

authors

Bakaki PM,Koroukian SM,Jackson LW,Albert JM,Kaiboriboon K

doi

10.1016/j.eplepsyres.2013.05.005

keywords:

["Administrative data","Epilepsy","Incidence"]

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

273-9

issue

1-2

eissn

0920-1211

issn

1872-6844

pii

S0920-1211(13)00145-9

journal_volume

106

pub_type

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