Survival of Parkinson's disease patients in a large prospective cohort of male health professionals.
Parkinson's disease (PD) patients have higher mortality than individuals without PD. However, most of the previous studies were based on prevalent cases and few examined the potential effects of duration and smoking on the survival of PD patients. We compared the survival experience of 288 men with incident PD diagnosed between 1986 and 2000 with that of 51,012 men free of PD in the Health Professionals Follow-up Study. As of January 2002, 92 deaths occurred among PD cases and 8,485 among men without PD. After controlling for age, men with PD had 60% higher mortality than those without PD (95% CI: 1.3-2.0). PD mortality was strongly related to disease duration: compared with men without PD, the age-adjusted relative risk for PD patients was 1.1 during the first 5 years from diagnosis, 2.3 from 5 to 10 years, and 3.5 after 10 years (P < 0.0001 for trend). As expected, cigarette smoking was strongly and positively associated with total mortality among men free of PD (comparing >30 pack-years vs. never smokers, relative risk, 2.0; P < 0.0001 for trend), but this association was not observed among PD patients (RR: 1.0; P = 0.95 for trend). This study confirms that PD patients have a higher mortality than individuals without PD and that the excess mortality increases with disease duration. However, smoking seems to impose little additional risk among PD patients in this large cohort of health professionals.
Chen
Honglei
H
Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709, USA. Chenh2@niehs.nih.gov
Zhang
Shumin M
SM
Schwarzschild
Michael A
MA
Hernán
Miguel A
MA
Ascherio
Alberto
A
D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D005500:Follow-Up Studies; D006282:Health Personnel / Q000706:statistics & numerical data*; D006801:Humans; D008297:Male; D008404:Massachusetts; D008875:Middle Aged; D010300:Parkinson Disease / Q000175:diagnosis / Q000401:mortality*; D011446:Prospective Studies; D012016:Reference Values; D012306:Risk; D012907:Smoking / Q000009:adverse effects / Q000401:mortality; D013223:Statistics as Topic; D016019:Survival Analysis