Table 3.

Characteristics of mothers giving birth from 2015 to 2017.

Characteristic		Mean (SD) or n/N (%)
Age, years		28.6 (5.82)
Married		6,466,521/10,824,077 (59.74)
White, non-Hispanic		5,852,869/11,187,000 (52.32)
Black, non-Hispanic		1,600,020/11,187,000 (14.30)
Asian, non-Hispanic		717,706/11,187,000 (6.42)
Hispanic ethnicity		2,666,823/11,187,000 (23.84)
US born		8,645,413/11,257,974 (76.79)
Education
	Less than high school		1,561,190/11,139,992 (14.01)
	High school		2,829,005/11,139,992 (25.40)
	Some college		3,238,463/11,139,992 (29.07)
	College		2,221,480/11,139,992 (19.94)
	Master’s or doctorate		1,289,855/11,139,992 (11.58)
Birth outcomes
	Low birth weight		717,541/11,272,819 (6.37)
	Preterm birth		891,628/11,273,872 (7.91)