Preterm (%) N = 19,027 | Term (%) N = 205,894 | p-value | Total births (%) N = 224,921 | |
---|---|---|---|---|
Demographic factors | ||||
Advanced maternal age | ||||
35 – 39 years | 1901 (10.0) | 19,302 (9.4) | <0.01 | 21,203 (9.4) |
≥40 years | 482 (2.5) | 3952 (1.9) | 4434 (2.0) | |
Race and ethnicity | ||||
Non-Hispanic White | 9940 (52.7) | 127,636 (62.6) | <0.01 | 137,576 (61.2) |
Non-Hispanic Black | 7507 (39.8) | 59,630 (29.2) | 67,137 (30.1) | |
Hispanic | 937 (5.0) | 10,583 (5.2) | 11,520 (5.2) | |
Other | 457 (2.4) | 6.116 (3.0) | 6573 (2.9) | |
Social behaviors & socioeconomic factors | ||||
Education | ||||
Less than high school | 4778 (25.4) | 40,658 (19.9) | <0.01 | 45,436 (20.4) |
High school graduate | 5127 (27.3) | 50,721 (24.9) | 55,848 (25.1) | |
Some postsecondary | 8875 (47.3) | 112,590 (55.2) | 121,465 (54.5) | |
Tobacco use | 4568 (24.0) | 38,292 (18.6) | <0.01 | 42,860 (19.1) |
Medicaid insurance | 9672 (50.8) | 87,631 (42.6) | <0.01 | 97,303 (43.3) |
Prenatal care initiation | ||||
First trimester | 8051 (61.6) | 103,232 (67.7) | <0.01 | 111,283 (67.2) |
Second trimester | 3219 (24.6) | 36,882 (24.2) | 40,101 (24.2) | |
Third trimester | 708 (5.4) | 7897 (5.2) | 8605 (5.2) | |
No prenatal care | 1092 (8.4) | 4422 (2.9) | 5514 (3.3) | |
Year of birth | ||||
2007 | 5234 (27.5) | 55,325 (26.9) | 0.01 | 60,559 (26.9) |
2008 | 4969 (26.1) | 52,708 (25.6) | 57,677 (25.6) | |
2009 | 4600 (24.2) | 50,364 (24.5) | 54,964 (24.4) | |
2010 | 4225 (22.2) | 47,497 (23.1) | 51,721 (23.0) | |
Season | ||||
Winter | 4755 (25.0) | 50,205 (24.4) | 0.26 | 54,960 (24.4) |
Spring | 4787 (25.1) | 51,827 (25.2) | 56,614 (25.2) | |
Summer | 4835 (25.4) | 53,173 (25.8) | 58,008 (25.8) | |
Fall | 4650 (24.4) | 50,689 (24.6) | 55,339 (24.6) |