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Plurality Characteristics, United States

The following table shows the number, percent, weight, and mean age of infants, according to birth plurality.

Percent very preterm11.611.936.159.978.3
Percent preterm210.458.292.496.891.3
Mean gestational age (weeks)38.835.332.229.928.5
Percent very low birthweight31.110.234.561.183.8
Percent low birthweight46.155.494.498.894.1
Mean birthweight (grams)3,3322,3471,6871,3091,105
1. Very preterm is less than 32 completed weeks of gestation.
2. Preterm is less than 37 completed weeks of gestation.
3. Very low birthweight is less than 1,500 grams.
4. Low birthweight is less than 2,500 grams.
Source: National Center for Health Statistics, National Vital Statistics Reports, vol. 52, no. 10, Dec. 17, 2003. Web: www.cdc.gov/nchs .

Selected Demographic and Health Characteristics of Births by Race of Mother, 2004BirthsLive Births and Birth Rates, by Year