Objective: To determine the number of women aged 15 to 44 years with impaired fecundity every 5 years from 1995 to 2020. Design: Data are used from cycle IV of the National Survey of Family Growth conducted by the National Center for Health Statistics. Population projections prepared by the U.S. Census Bureau are used for the expected population base for 1995 to 2020. Prospective demographic projection analysis is used to estimate the number of women with impaired fecundity. Participants: The National Survey of Family Growth interviewed 8,450 women aged 15 to 44 years as of March 15, 1988. Main Outcome Measure: Number of women with impaired fecundity. Results: The number of women with impaired fecundity may drop from 5.1 million in 1995 to 4.7 million in 2015 and then rise to 4.8 to 5.9 million in 2020. Conclusion: The age structure of the population will cause the absolute number of women with impaired fecundity in the United States to increase slowly, if at all, over the next 25 years.
