From the 2006 National Survey of Family Growth:
What is your current marital status? Are you:
The last time you and your partner had intercourse, did you or she use any method to prevent pregnancy or sexually transmitted diseases?
The original baseline and baseline year were revised from 55.2 to 45.8 and from 2008-08 to 2006-10, respectively. The target was adjusted from 60.7 to 50.4 to reflect the revised baseline using the original target-setting method.