Table 1.
Descriptive statistics on city- and individual-level variables among singleton live births to U.S.-born and foreign-born non-Hispanic black women in the U.S. 2008–2010a.
| U.S.-born | Foreign-born | |
|---|---|---|
| Number of births | 746,700 | 114,750 |
| City-level variables | Mean (SD) | |
| Residential segregation | ||
| NHB-NHW dissimilarity | 57.4 (15.7) | 60.3 (19.5) |
| Political power | ||
| Black political power | 1.1 (0.4) | 1.0 (0.5) |
| Sociodemographics | ||
| Total population | 1,008,120 (1,866,890) | 2,659,580 (3,500,240) |
| Poverty rate | 21.9 (6.0) | 19.4 (4.9) |
| % college education | 17.0 (5.0) | 18.8 (4.6) |
| Individual-level variables | n (%) | |
| Preterm delivery | ||
| Term | 630240 (84.4) | 818190 (90.0) |
| Preterm ( < 37 weeks) | 116460 (15.6) | 90580 (10.0) |
| Very preterm ( < 32 weeks) | 21385 (2.9) | 2416 (2.1) |
| Birth weight | ||
| Low ( < 2500 g) | 90460 (12.1) | 9504 (8.3) |
| Normal ( ≥2500 g) | 656234 (87.9) | 105240 (91.7) |
| Maternal age | ||
| < 20 | 141200 (18.9) | 4110 (3.6) |
| 20–35 | 549320 (73.6) | 83840 (73.1) |
| > 35 | 56180 (7.5) | 26800 (23.4) |
| Maternal education | ||
| Less than high school | 8690 (1.2) | 7770 (6.8) |
| Some high school | 176040 (23.6) | 13340 (11.6) |
| High school/GED | 270700 (36.3) | 37360 (32.6) |
| Some college | 216440 (29.0) | 32690 (28.5) |
| College graduate | 74830(10.0) | 23580 (20.6) |
| Marital status | ||
| Unmarried | 605880 (81.1) | 51080 (44.5) |
| Married | 140820 (18.9) | 63670 (55.5) |
| Parity | ||
| Primiparous | 304910 (40.8) | 44220 (38.5) |
| Multiparous | 441780 (59.2) | 70520 (61.5) |
a
Singleton NHB births to US residents living in a city with population of > 50,000 at least 10% NHB.