Metabolic Syndrome and Parkinson's Disease Incidence: A Nationwide Study Using Propensity Score Matching.
Metabolic syndrome (MetS) and Parkinson's disease (PD) share common pathophysiological mechanisms. This study aimed to investigate the influence of MetS on PD incidence.  A propensity score-matched cohort study was conducted using the National Health Insurance Service-National Health Screening Cohort (NHIS-HealS) data (2002-2015) from the Korean National Health Insurance Service. Individuals with MetS were identified from those who underwent a health checkup in 2009-2010 and were 1:1 matched to individuals without MetS (non-MetS) using the propensity score method. Among 314,737 eligible individuals, 85,530 MetS and non-MetS pairs were selected.  During a mean follow-up of 7.23 years, 819 (0.48%) PD cases occurred. Individuals with MetS exhibited 1.23 times greater PD incidence (95% confidence interval [CI], 1.06-1.43; P = 0.006). The risk of PD increased with the number of MetS components, with the presence of five MetS components altogether doubling the incidence of PD (odds ratio [OR], 2.00; 95% CI, 1.30-3.04; P = 0.001). High blood pressure, low high-density lipoprotein cholesterol, and high fasting blood glucose increased PD incidence by 1.34 times (95% CI, 1.15-1.58; P < 0.001), 1.31 times (95% CI, 1.13-1.52; P < 0.001), and 1.20 times (95% CI, 1.04-1.38; P = 0.013), respectively. Elevated waist circumference was not associated with PD incidence (OR, 1.11; 95% CI, 0.96-1.28; P = 0.176). High triglycerides exerted a protective effect against PD incidence especially in men (OR, 0.66; 95% CI, 0.54-0.81; P < 0.001).  MetS may be a risk factor for PD incidence, and individual components of MetS exert different effects depending on sex.
['Roh|Ji-Hye|JH|', 'Lee|Sangjin|S|', 'Yoon|Jeong-Hyun|JH|']
D000328:Adult D000368:Aged D016208:Databases, Factual D005260:Female D006801:Humans D015994:Incidence D008297:Male D024821:Metabolic Syndrome D008875:Middle Aged D010300:Parkinson Disease D011379:Prognosis D057216:Propensity Score D056910:Republic of Korea D018570:Risk Assessment D012307:Risk Factors D012737:Sex Factors D013997:Time Factors
metabolic syndrome Parkinson's disease propensity score matching cohort risk