Abstract:
OBJECTIVE:To determine the relative risk (RR) and cumulative incidence of idiopathic Parkinson's disease (PD) in first-degree relatives of PD patients compared with relatives of controls from the same geographic region. DESIGN:A family history questionnaire was used to obtain information on all first-degree relatives of cases and controls. A subset of these first-degree relative was also examined. A Cox proportional hazards model with double-censoring techniques for missing information was used to model the RR for PD, adjusting for gender, ethnicity, and relationship to proband. RESULTS:A total of 1,458 first-degree relatives of 233 PD patients were 2.3 times as likely (95% CI = 1.3 to 4.0) as 7,834 relatives of 1,172 controls to develop PD. The cumulative incidence of PD to age 75 among first-degree relatives of PD patients was 2% compared with 1% among first-degree relatives of controls. The risk in male first-degree relatives was higher than in female relatives (RR = 2.0, 95% CI = 1.1 to 3.4) and the risk in relatives of Caucasians was higher than in African-Americans and Hispanics (RR = 2.4, 95% CI = 1.4 to 4.1). Risk for siblings and parents of probands was similar. CONCLUSIONS:Susceptibility to PD is increased in first-degree relatives of both sporadic and familial cases. The pattern of inheritance and the relationship between genetic and environmental risk factors warrant further study.
journal_name
Neurologyjournal_title
Neurologyauthors
Marder K,Tang MX,Mejia H,Alfaro B,Côté L,Louis E,Groves J,Mayeux Rdoi
10.1212/wnl.47.1.155subject
Has Abstractpub_date
1996-07-01 00:00:00pages
155-60issue
1eissn
0028-3878issn
1526-632Xjournal_volume
47pub_type
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