Abstract:
BACKGROUND:Relatively few epidemiologic studies have focused on narcolepsy, a disabling sleep disorder with a strong association with HLA-DQB1 *0602. METHODS:We sought to estimate the prevalence of narcolepsy using multiple overlapping techniques to identify residents of King County, WA who were 18 years or older with physician-diagnosed narcolepsy. Patients were entered into a registry and recruited into an epidemiologic study entailing interview and buccal scrapings to determine HLA-DQB1 *0602 status. Missing values were imputed to allow prevalence to be estimated based on all 425 patients entered into the registry between 2001 and 2005, whether they were recruited into the epidemiologic study (n=279) or not (n=146). RESULTS:As of July 01, 2001, estimated prevalence per 100,000 of physician-diagnosed narcolepsy with cataplexy was 21.8 (95% confidence interval (CI): 18.8-24.8), similar to prior studies. The median age of onset was 14 (interquartile range: 10-18). For narcolepsy with HLA-DQB1 *0602, prevalence was 15.3 (95% CI: 12.8-17.9). Estimated prevalence was higher in women than men and in African-Americans than other racial groups. CONCLUSIONS:These differences could reflect problems in identification and recruitment or may provide etiologic clues about narcolepsy. This study illustrates the challenges in performing population-based studies of narcolepsy.
journal_name
Sleep Medjournal_title
Sleep medicineauthors
Longstreth WT Jr,Ton TG,Koepsell T,Gersuk VH,Hendrickson A,Velde Sdoi
10.1016/j.sleep.2008.05.009subject
Has Abstractpub_date
2009-04-01 00:00:00pages
422-6issue
4eissn
1389-9457issn
1878-5506pii
S1389-9457(08)00167-6journal_volume
10pub_type
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