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Table 1 Percentage of all preterm births (20- < 37 weeks gestation) and third trimester preterm births (28- < 37 weeks gestation) across maternal characteristics, singleton births, United States, 2010

From: A gestational vulnerability window for smoking exposure and the increased risk of preterm birth: how timing and intensity of maternal smoking matter

  N (%) Preterm (%) 20- < 37 weeks Preterm (%) 28- < 37 weeks
Total N (%) 2,485,743 (100) (7.95) (7.49)
Race/ethnicity
 Non-Hispanic White 1,320,489 (53.12) (7.27) (6.94)
 Non-Hispanic Black 296,389 (11.92) (11.48) (10.37)
 Hispanic 690,911 (27.79) (7.84) (7.40)
 Non-Hispanic Asian 154,607 (6.22) (7.29) (6.96)
 Non-Hispanic American Indian 24,992 (0.84) (9.30) (8.87)
Age (years)
 12–19 237,060 (9.54) (9.08) (8.45)
 20–34 1,896,901 (76.31) (7.62) (7.18)
 35 or older 351,782 (14.15) (8.99) (8.50)
Education
 Less than high school 506,474 (20.38) (8.94) (8.39)
 High school 618,388 (24.88) (8.62) (8.06)
 Some college 691,508 (27.82) (8.26) (7.78)
 Graduate school 669,373 (26.93) (6.28) (5.99)
Marital Status
 Unmarried 1,001,617 (40.29) (9.22) (8.58)
 Married 1,484,126 (59.71) (7.10) (6.76)