作者：Chaddock, RE
作者单位：Columbia University
摘要：The infant death rates in the 10 health areas of the Health Center District of New York City are compared. No significant differences are found in the 1929-1931 rates of the 4 areas of the Old Demonstration District, but in many cases rates in these areas are significantly less than those in the other 6 areas. In the 4 areas of the Old Demonstration District there was a downward trend in infant death rates from 1921 to 1931 inclusive, the average annual decrease being 1.8 per 1000 births.
作者：Kiser, CV
摘要：This paper describes the bias encountered and the steps to eliminate it in a recent study of fertility in selected areas of Syracuse, New York. The original number of families visited was 1,564 and the final number was 2,890. The pitfalls discussed are failure to re-visit homes which are missed during the first canvass and the omission of secondary families, i.e., those represented by resident married individuals other than heads and wives. Families originally missed were found to be conspicuo...
