The statistical report1 on infant mortality in 985 cities of the United States during 1933 contains several features of especial interest. The report includes infant mortality data for every city of 10,000 population and more, as the result of the inclusion for the first time of cities in Texas and South Dakota. Because of recent statistical research, the detailed tables in this year's report differ from the tables previously presented in that the annual rate for 1933 is given only for those cities in which there were more than 450 births. The reason for this change is that the rates for small cities have little significance, owing to the wide fluctuations in rate from year to year, which is explained by the small number of births on which they must be based.
The urban infant mortality rate for 1933 is 57.1. This figure is based on 983 cities in the
INFANT MORTALITY IN 1933. JAMA. 1934;103(24):1856-1857. doi:10.1001/jama.1934.02750500038014