The Fertility of American Women

By Wilson H. Grabill; Clyde V. Kiser et al. | Go to book overview

APPENDIX B PROCEDURES FOR CONSTRUCTING AND USING COHORT FERTILITY TABLES IN CHAPTER 9, AND EVALUATION OF RESULTS

The data on the fertility of cohorts of native white women which are used in Chapter 9 of this monograph are taken from the more comprehensive tables for native white women and for all women which are being prepared by the Scripps Foundation for Research in Population Problems, Miami University, and are scheduled for publication in late 1958 or in 1959. A more comprehensive description of procedures and evaluation of results will accompany the detailed tables. Portions of these materials are presented here in somewhat condensed form.


1. Computing central birth rates for all women in native white cohorts

As was stated in Chapter 9, a cohort of native white women in the fertility tables in question is defined as beginning with the girl babies who are born in the United States during a year from July 1 to June 30, inclusive, and as consisting thereafter of the survivors of these babies. Accordingly, on July 1 of subsequent calendar year y the members of the cohort of July-June year y-x are between exact ages x and x + 1 and their average age is approximately x + ½ (for example, the women in the cohort of 1930 are between exact ages 20 and 21 on July 1, 1950, and their average age is about 20.5). In order to compute precisely the central birth rates in calendar year y for cohort y-x it is necessary to know (a) the number of women aged x to x + 1 on July 1 of year y, and (b) the number of births to these women during year y. Since exact numbers are not available, estimates must be used.

Annual numbers of women. The number of women in each cohort, that is, the number aged x to x + 1 on July 1 of each calendar year, was estimated in part from the numbers of women in 5-year age groups according to the Censuses of 1920 to 1950. First, the census data were adjusted in minor degree to allow for underenumeration and misstatement of age. The adjustment factors were developed by Dr. Norman B. Ryder while he was on the staff of the Scripps Foundation and took into account the work

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