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

A person aged 13 - 19.

Live born child. Multiple births (for example, twins or triplets) are counted as separate live births, although they represent a single delivery.

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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