医学科研设计的一项重要原则是纯化对象——挑选的受试者尽量一致。样本不同质,杂因干扰多,观察指标及试验效应必不突出,便难以达到研究目的。本刊习称的“飞行人员”(空中勤务人员)包括驾驶员、领航员、通讯员、空中机械师和飞行乘务员等,他们的工作方式、性质不同,选拔时的体检标准不一,成长过程各异,是一个复杂的群体。把他们混在一起作为研究对象是不妥当的。即使都是“飞行员”(驾驶员),轰炸机、运输机、直升机飞行员与歼(强)击机的飞行员工作条件也大不相同,飞行时间也不宜混合统计。故除研究特定职务的飞行人员外,做军事航空医学研究时以歼(强)击机飞行员作对象更为得当。对照组也应遵从“齐同对比”原 An important principle of medical research design is to purify the subject - the subjects chosen should be as consistent as possible. Samples of different quality, interference and more interferences, observation indicators and test effects will not be prominent, it is difficult to achieve the purpose of the study. The “flight crew” (aerial service personnel) referred to in this journal include pilots, navigators, correspondents, air mechanics, flight attendants, etc., whose working methods and properties are different from each other in the selection of physical examination standards and growth The process is different, is a complex group. To mix them as a research object is not appropriate. Even pilots (pilots), bomber, transport aircraft, helicopter pilots and F (pilot) pilots have very different working conditions and flight time should not be mixed statistics. Therefore, in addition to studying the specific duties of pilots, the military aviation medical research to J (strong) pilot aircraft pilots as a more appropriate target. The control group should also follow the “same with the contrast” the original