In the United States, of the 12% of abortions at 13 weeks or later in 2006, 57% were at 13-15 weeks, 31% at 16-20 weeks, and 11% at 21 weeks or later.
Pazol K, Gamble SB, Parker WY, Cook DA, Zane SB, Hamdan S. Abortion surveillance - United States, 2006. MMWR Surveill Summ 2009;58:1-35









