多数研究不能把一般人群当中的发病频率给予定量是因为它们是基于医院的并且被混杂在住院率的变化之中。
Most studies could not quantify disease frequency in the general population as they are hospital-based and confounded by variations in threshold and the rate of hospitalization.
同时在试验过程中采用四点响应信号综合评估法，证实能有效地分离出混杂在扭转振动信号中的弯曲振动的频率成分，提高了结果的准确性。
In the experiment, 4 signals are evaluated synthetically to separate the bending component intermixed in the torsional vibration so as to improve the accuracy of test results.
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