队列研究中，如果随访时间较长，观察人数变动较大时，多采用下列哪种指标表示发病水平（）。_流行病学_全学科试题题库

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队列研究中，如果随访时间较长，观察人数变动较大时，多采用下列哪种指标表示发病水平（）。
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