COLLABORATIVE STUDIES OF LESS COMMON OR LESS DEBILITATING NEUROLOGIC DISORDERS

许多合作努力涉及对 不寻常的或较少衰弱的特征（例如，头痛）神经病学 疾病现象。不寻常的关联或空间/时间集群 神经系统疾病可以提供病因学或治疗的线索。这些可能是 通过更正式的方法进行测试。 流行病学和自然史调查及一项病例对照研究 进行性核上性麻痹（PSP）已在两个县完成， 新泽西。点患病率为1.39/10万。中位数间隔为 开始需要帮助的时间为3.1年，死亡时间为9.7年。的 病例对照研究未涉及卒中、高血压或 吸烟是PSP的危险因素。2001年北京市100名老年人偏头痛患病率调查 中华人民共和国的点患病率为690/100，000， 女性患病率高于男性， 对于男性来说。

A number of collaborative efforts involve the investigation of the characteristics of unusual or less debilitating (e.g., headache) neurologic disease phenomena. Unusual associations or space/time clusters of neurologic disorders may provide leads to etiology or therapy. These may be tested through more formal approaches. Surveys of prevalence and natural history and a case control study of progressive supranuclear palsy (PSP) have been completed in two counties in New Jersey. The point prevalence was 1.39/100,000. The median intervals to onset of requiring assistance was 3.1 years and to death was 9.7 years. The case control study did not implicate a history of stroke, hypertension or smoking as risk factors for PSP. A prevalence survey of migraine in the People's Republic of China yielded a point prevalence ratio of 690/100,000, and indicated that the prevalence ratio for females was higher than that for males.