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对４个医疗单位精神科住院病人中的晚发性精神分裂症２４７例进行观察，以非晚发性精神分裂症病人２６４例为对照。结果发现，晚发组女性显著较多，病前性格内向者显著较少，家族精神病遗传史显著较少。发病诱因以晚发组显著较多，起病急或亚急者亦然。两组文化程度相仿，近期疗效以晚发组显著较好。作者认为，不仅有年龄的不同，晚发组病例在其他方面也有不少特点，精神分裂症应有晚发型为独立的亚型。
247 cases of late-onset schizophrenia in psychiatric inpatients in 4 medical units were observed, and 264 cases of non-schizophrenic patients were compared. The results showed that there were significantly more women in the late-onset group, significantly fewer introverts in the pre-illness, and significantly fewer genetic history of familial psychosis. The predisposing factors were significantly more in the late-onset group, and those with acute or sub-acute onset were also notable. The two groups of similar degrees of education, the recent efficacy of late-onset group was significantly better. The author believes that not only different age, late-onset group of patients also have many other characteristics, schizophrenia should have late-onset as an independent subtype.