Source(s)

Ventura SJ, Abma JC, Mosher WD, Henshaw S. Estimated pregnancy rates for the United States, 1990-2000: An Update. National vital statistics reports; vol 52 no 23. Hyattsville, Maryland: National Center for Health Statistics. 2004.

Definitions

Abortion that has been caused by deliberate human action. An abortion is the removal or expulsion of an embryo or fetus from the uterus, resulting in or caused by its death.

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Rounding Rules

Odds more likely than 1 in 10, such as 1 in 3.42, are rounded to three significant digits. Odds less likely than 1 in 10, such as 1 in 420.4, are rounded to four significant digits. Trailing zeros after the decimal point are dropped for readability, even though they may still be significant.

Odds you'll see: 1 in 4.26; 14.5; 143; 5,230; 433,200

Odds you won't see: 1 in 2.412; 63.042; 425,242c