肿瘤发病率是在既定的年度和某地区内,以总户籍人口平均数作分母,以被动收集得到的已确认的所有的恶性肿瘤病例总数作分子,得到的相对数或频数指标。
奇怪的是,雌鼠的肿瘤发病率极低,与对照组几乎没有差别。
Oddly enough, the incidence of tumors in females was minimal, barely different from the control group.
在研究中任一个肿瘤发病率增加的证明纯粹是偏见造成的结果。
One believes any increased incidence of tumours shown in the study is purely the result of the biases.
脑肿瘤发病率逐日升高,是严重危害人类生命健康的重大疾病之一。
As one of the serious diseases threatening the health of human being, the brain tumor has an increasing incidence.
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