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为探明列车环境与旅客精神障碍的关系，作者对旅客精神障碍的发生及其所乘列车的环境因子进行了现场调查和监测。结果显示：９７％的患者是在超员状态发病的，车厢空气中的ＣＯ２平均值为０．２２６ｍｇ／ｍ３。旅客精神障碍的发病率随车厢人均容积的缩小而呈几何性增高，环境中的低气压、低气流及相对偏高的气温、气湿对旅客精神障碍的发生有共同促进作用（Ｒ＝０．９５３１）。由此认为：严重超员造成的旅行环境恶化是诱发旅客精神障碍的重要因素。
In order to find out the relationship between train environment and passenger’s mental disorder, the author conducted on-site investigation and monitoring on the occurrence of passenger’s mental disorder and the environmental factors of the train. The results showed that: 97% of patients are in the state of overcrowding, compartment air CO2 average 0.226mg / m3. The incidence of mental disorders in passengers is geometrically increased with the reduction of the volume per passenger compartment. Low air pressure, low airflow and relatively high temperature and humidity in the environment contribute to the development of passenger mental disorders (R = 0. 9531). This suggests that: Deterioration of the travel environment caused by serious overcrowding is an important factor in inducing mental disorders in travelers.