Briefly: How is the 'Roughly 1 in 4' Statistic Calculated?

Briefly: How is the 'Roughly 1 in 4' Statistic Calculated?

Analysis released when The National Campaign was formed in 1996 suggested that more than 4 out of 10 girls in the United States became pregnant at least once before age 20.  Since then, this percentage has declined steadily, so that it was subsequently characterized as “1 in 3,” then “nearly 3 in 10,” and now has decreased to “roughly 1 in 4.”  How this statistic is estimated may not be obvious, so this brief explains the methods and data used to calculate this widely cited statistic.

Publication date: January 2015

Suggested Citation(s): The National Campaign to Prevent Teen and Unplanned Pregnancy. (2015). Briefly: How is the 'Roughly 1 in 4' Statistic Calculated?  Washington, DC: Author.