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2、患病率（prevalence）：某特定时间内总人口中某病新旧病例所占的比例。 患病率可按观察时间的不同分为时点患病率和期间患病率。 Diagnostic data from detailed clinical assessments of 17,524 individuals [published online ahead of print, 2021 may 21]. prevalence描述的是多少，是一种静态的状态；Incidence描述的是快慢，描述的是变化。 我做一个近似的比喻。患病的人数是绝对多少 a 就像是一个点的位置，但这种绝对位置是没办法描述出来的，需要一个参考坐标来帮着定位，这时候给一个人群总数 N 就像是给了个坐标系，那么prevalence = a/N 就是坐标.
It differs from lifetime prevalence in focusing on only 1 year. Prevalence of mental disorders in school children and adolescents in china prevalence则是衡量患有morbidity疾病的水平。 而我们考试incidence和prevalence的鉴别考查会比较多，如图。 从定义上就知道了，incidence就是新发病率，prevalence是患病率。 prevalence患病率=incidence新发病率 x 时间。 所以要区分概念，这俩的区别更重要。
这篇论文研究了澳大利亚昆士兰五种常见野生鸟类，分别是澳大利亚喜鹊、笑翠鸟、冠鸠、彩虹吸蜜鹦鹉和鳞胸吸蜜鹦鹉。 发现了在496个样本中，共有24个个体表现出基因型与性腺性别的不一致，占总样本的4.8%。（不同种类性转率不同。） 也就是说大约5%的鸟类发生了性别转换，甚至还有公的笑.
第一个问题是： 根据这份研究报告，中国的抑郁症发病率是怎样的呢？和美国相比，有没有差别？ 首先，我们要弄清楚两个流行病学中的概念，一个是“终身患病率”（也就是lifetime prevalence rate），另一个是“过去一年患病率“（也就是one-year prevalence rate）。 “终身发病率”指的是：某人在其一生. 我国高度近视患者超1.3亿，并发症致盲率高达60%，委员建议将其纳入慢病管理，为何我国近视的人这么多？ 如图，为什么分母要-0.5*2患病率（prevalence rate）也称 现患率，流行率。是指某特定时间内总人口中某病新旧病例所占比例。 患病率可按观察时间的不同分为期间患病率和 时点患病率 两种。时点患病率较常用。通常患病率时点在理论上是无长度的，一般不超过一个月。而期间患病率所指的是特定的. Li f, cui y, li y, et al
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