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采用前瞻性主动临床筛检与核素骨扫描结合确诊应力骨折（ＳｔｒｅｓｓｆｒａｃｔｕｒｅＳＦ）病例，对某部队１９９３年度新兵基础训练期间发生的ＳＦ进行了流行病学调查。经与１９９２年同样方法收集的数据进行对比分析发现，１９９３年ＳＦ发生率较１９９２下降了３７．６１％。１９９２年底部队领导曾作出１９９３年开训第１个月严格控制训练强度的“四不准”的规定。本文通过对１９９２、１９９３年基础训练的类同性分析；１９９２、１９９３年ＳＦ发生率，训练初４周和后４周ＳＦ发生率的对比分析，讨论了１９９３年ＳＦ发生率下降归因于“四不准”规定的问题。“四不准”干预未设同期对照，但可认为是一项“类实验”。
The prospective active clinical screening and radionuclide bone scan combined with stress fractures (StressfractureSF) cases, a unit of recruits during 1993 basic training during the SF epidemiological survey. Comparing the data collected in 1992 with the same method, we found that the incidence of SF in 1993 dropped by 37.61% compared with 1992. At the end of 1992, the leadership of the armed forces had made the “four no-admits” provisions that strictly controlled training intensity in the first month of training in 1993. In this paper, the basic analysis of 1992, 1993, the same sex analysis; 1992, 1993, the incidence of SF, the first 4 weeks of training and after 4 weeks of SF incidence analysis to discuss the 1993 SF incidence decline due to the “four Not allowed ”the provisions of the problem. The “no four” intervention did not set the same period of control, but can be considered as a “class experiment.”