医学设计需要有关卫生问题的程度和分布的资料,而这种资料常常是不易得到的,特别是当地的。在这种情况下,几乎任何一个医生本人都可以发现需要进行一项简单的横切面调查。本篇和下一篇将就此问题帮助他们。初期设计实际资料收集只是在后期才开始,其成 Medical design requires information about the extent and distribution of health problems, and such information is often not easily available, especially in the local area. In this case, almost any doctor himself can find that a simple cross-sectional survey is needed. This and the next article will help them on this issue. The initial design of actual data collection only started in the later period.