PARKINSON'S DISEASE

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Abstract
In this study only those cases were included in which the diagnosis was thought to be certain. Postencephalitic cases were not considered. For estimation of age and sex incidence 146 cases were used; for clinical studies, 140. The advantages of these records for source material as compared with hospital records are their uniformity, since they have all been under the direction of one person and written by a small number of historians (each has averaged about four years), and their brevity which, since only the more significant data are recorded, is in favor of greater accuracy. Their disadvantages are their occasional incompleteness and the limitation to positive data and to private cases. The restriction of statements to positive findings is compensated for by the fact that conclusions drawn from the recorded facts are minimal and therefore conservative. That age and sex distribution among private and dispensary cases runs along the

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