Is it ensure, insure, or assure?
vital statistics pl.n.
Statistics concerning the important events in human life, such as births, deaths, marriages, and migrations.
relative frequencies of vital occurrences that affect changes in the size and composition of a population. When calculated per 1,000 inhabitants-as is conventional in vital-statistics publications-they are referred to as crude rates. More refined rates often must be used in the more meaningful analysis of population change