临床观察的测量可以获得各种不同的数值,其数值的获得取决于测定时各种有关因素的状态.有时,某一观察或一批观察其差异或变异程度相差较大,观察者得不到能代表该观察对象的数值.为获取资料的正确结论,医师应了解产生变异的原因和它在观察中所占的比重. Measurements of clinical observations can be obtained in various values. The acquisition of values ​​depends on the status of various relevant factors at the time of measurement. Occasionally, the difference or degree of variation in one observation or batch observation is quite different, and the observer cannot obtain the value. Can represent the value of the observation object. In order to obtain the correct conclusions of the data, the physician should understand the cause of the variation and its proportion in the observation.