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调查了曾长期移居青海高原（海拔２２６０～４２００ｍ）后返回平原以及仍留居高原的９４３３名离休干部的生存情况，并对该资料进行生存率和Ｒｉｄｉｔ分析。结果为总的趋势是离休后２年以内高原组生存率略高于平原组（Ｐ＞００５），２年后各年平原组生存率均高于高原组（Ｐ＜００５）；Ｒｉｄｉｔ分析结果为返回平原组的平均Ｒｉｄｉｔ值比留居高原的平均Ｒｉｄｉｔ值大（Ｐ＜００１），高原居住地海拔愈高、返平原时年龄越大，平均Ｒｉｄｉｔ值愈小（Ｐ＜００１）。说明脱适应对移居平原的人寿命无影响，但对移居平原后不久的人群可能有影响，居住地海拔高、年龄大的老年人返平原后出现脱适应的可能性也大。
Surveys were conducted to investigate the survival of 9,433 retired cadres who returned to the plains and were still living in the plateau after long-term emigration to the Qinghai Plateau (2260-4200m above sea level). Survival data and Ridit analysis of the data were conducted. The overall trend was that the survival rate in the plateau group was slightly higher than that in the plain group (P <005) within 2 years after recuperation, and that in the plain group after 2 years was higher than that in the plateau group (P <005). Ridit analysis showed that the average Ridit value returned to the plain group was larger than the average Ridit value (P <001) of the resident plateau, and the higher the altitude of the plateau residence, the larger the age of return plain and the smaller the average Ridit value (P < 0 01). It shows that extrinsic adaptation has no effect on the life of people who have migrated to the plains, but may have an impact on the population after immigrating to the plains. There is also a high possibility of being rescued after the elderly have returned to the plain at high altitude.