Data concerning the planning circumstances of the interval preceding each pregnancy,
collected from a national sample of 4810 married women, are used to establish the fertility …

Measures of pregnancy intervals are reported for data from the 1975 National Fertility Study
in the United States. The structure of such intervals is aggregated into its components by …

The foundation for the unique contribution a fertility sur-vey can make to the understanding
of reproductive behavior is the classification of successive pregnancy intervals by planning …

An opportunity to estimate the reliability of survey data on family planning is afforded by a
longitudinal study of fertility in metropolitan areas of the United States. A probability sample …

On the basis of data from the 1965 National Fertility Study, Larry L. Bumpass and Charles F.
Westoff stated that" the elimination of unwanted births... would have resulted in considerable …

Fertility rates in the United States continued to decline between the early and mid-1970s as
they had during the previous decade. This change was part of a larger trend which was …

Data from the 1965 and 1970 National Fertility Studies are used to produce classifications of
births and exposure to births by planning status for real and synthetic marriage cohorts …

Methods It is not possible to analyze differential rates of fertility decline for population groups
of greatest interest directly from official vital statistics. It is, therefore, necessary to employ an …

In his article on the planning status of marital births, John Anderson has concentrated on
describing the group differences in unplanned and unwanted births in the United States in …

Administrators of family planning programs are constantly faced with the problem of the
evaluation of program effectiveness. In addition to internal program requirements for proper …