To investigate possible risk factors for Parkinson's disease (PD) we conducted a case-
control study of 150 PD patients and 150 age-and sex-matched controls. We interviewed
and examined all 300 subjects. We collected demographic data including lifetime histories
of places of residence, source of drinking water, and occupations such as farming. Subjects
completed a detailed questionnaire regarding herbicide/pesticide exposure. Rural living and
drinking well water were significantly increased in the PD patients. This was observed …

We studied the environmental risk factors of Parkinson's disease (PD) in Finland, particularly
those related to rural environment, in a prevalence material in 1992. The population
numbered 196,864 people, including urban and rural areas. In this community‐based study,
we used a case‐control method with personal investigation of the case subjects (n= 123)
and matched control subjects (n= 246). Analyses were carried out by conditional logistic
regression model. Case subjects had far fewer domestic animals at home during their …