欢迎来到牛牛题库网 牛牛题库官网
logo
搜索

问答题

The relationship between incidence and prevalence

【参考答案】

the numerator of incidence is new patient while the numerator of prevalence is new and old patients together.the denominator of incidence is population at risk which means only the people who will get the disease of interest can be calculated. While the denominator of prevalence is the average number of certain time and certain area.

点击查看答案

相关考题

单项选择题
George and Margaret and their children 21 at 140 Davis Street,22 the street from a small park．Their house is just off the main road．George usually goes to work by bus, but sometimes he goes 23 his car．The children usually go to school by bus．
The Glenns' house is 24 hidden among the trees．It has small bushes (灌木) planted around it．There is a fence 25 it and the house next door．It is a two-storey house, 26 the living room,dining room and kitchen(厨房) on the first floor,and the bedrooms and bathroom on the second floor．
The Glenns spend a lot of time at home． 27 now they are at dinner．Conversation (谈话) at the Glenns' house is usually lively at mealtime．The children are discussing trips they would like to take．
Susan,who has never 28 on a plane,says,"I'd like to 29 a plane to California．" Henry,who is elder,thinks it would be fun to be on a 30 ,heading for adventure(冒险) in Africa．Teddy,the youngest
child, says,"I want to go around the world on a train．" His elder brother and sister are still trying to 31 to him why this is not possible． 32 their mother says, "Children, you' ve spent too much time at the table．Henry and Susan, go and 33 your homework．Teddy,it' s time you were in bed．"
Soon there is silence throughout the 34 ．Teddy is in bed, Susan and Henry are in their rooms studying,and Mr．and Mrs．Glenns are in their living room, 35 George is sitting in his favorite(最喜欢的) chair,reading the paper and Margaret is sitting on the sofa,doing some sewing．
第（21）题答案
A.are
B.work
C.live
D.stay
单项选择题
关于非结构构件抗震设计的下列叙述，( )不正确。
A.框架结构的围护墙应考虑其设置对结构抗震的不利影响，避免不合理设置导致主体结构的破坏
B.框架结构的内隔墙可不考虑其对主体结构的影响，按建筑分隔需要设置
C.建筑附属机电设备及其与主体结构的连接应进行抗震设计
D.幕墙、装饰贴面与主体结构的连接应进行抗震设计
单项选择题
白口铸铁中的碳以（）形式存在。 A.
石墨 B.
渗碳体 C.
固溶体 D.
奥氏体
微信小程序免费搜题

All Rights Reserved 版权所有©牛牛题库网(nntiku.com)

备案号：湘ICP备2022003000号-1

微信扫一扫,加关注免费搜题

微信扫一扫,加关注免费搜题