以观察人时为分母计算发病率，用人时为单位计算出来的率带有瞬时频率性质称为发病密度
目的探讨危险因素调整的医院感染发病密度的计算方法及意义。
OBJECTIVE To discuss the calculation and epidemiological significance for risk factors adjusted incidence density of nosocomial infection.
方法比较医院感染累积发病率、发病密度和危险因素调整的发病密度的计算原理。
Methods to compare the principles and calculation methods of cumulative incidence rate, incidence density, and risk factors adjusted incidence density.
硒还可以帮助降低低密度脂蛋白或者坏胆固醇浓度，并减低血栓和心脏病的发病率。
Selenium also helps lower LDL or "bad" cholesterol and reduces the incidence of blood clots and heart disease.
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