1. U.S. teenage pregnancy statistics with comparative statistics for women aged 20–24;Henshaw,1999
2. The best intentions: unintended pregnancy and the well-being of children and families;Brown,1995
3. Intention status of U.S. births in 1988;Kost;Fam Plann Perspect,1995
4. Comparison of two question sequences for assessing pregnancy intentions;Kaufmann;Am J Epidemiol,1997
5. Exploring the concepts of intended, planned, and wanted pregnancy;Fischer;J Fam Pract,1999