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Percentage of preterm births based on gestational age in the United States
Percentage of preterm births based on gestational age in the United States
Year
Total preterm*
Late preterm
¶
32 to 33 weeks
28 to 31 weeks
<28 weeks
2019
10.23
7.46
1.18
0.93
0.66
2017
9.93
7.17
1.17
0.92
0.67
2015
9.62
6.87
1.17
0.91
0.68
2010
9.98
7.15
1.18
0.94
0.71
2007
10.44
7.51
1.22
0.97
0.74
* Preterm is less than 37 completed weeks of gestation.
¶ Late preterm is 34 to 36 completed weeks of gestation.
Data from:
Martin JA, Hamilton BE, Osterman M, et al. Births: Final data for 2019. Natl Vital Stat Rep 2021; 70:1.
Martin JA, Hamilton BE, Osterman M, et al. Births: Final data for 2017. Natl Vital Stat Rep 2018; 67:1.
Graphic 61972 Version 15.0
