Table 1 Characteristics of pregnant individuals, per pregnancy, in the PROMISE Study Populationa
|  | Excluded (n = 12,667) | Included (n = 77,599) |
|---|---|---|
Age at delivery [mean (SD)] | 27.0 (6.3) | 27.9 (6.1) |
Age at delivery [n (%)] | ||
  < 20 years | 1427 (11.3) | 6208 ( 8.0) |
 20 to < 25 years | 3633 (28.7) | 18,915 (24.4) |
 25 to < 30 years | 3329 (26.3) | 22,198 (28.6) |
 30 to < 35 years | 2535 (20.0) | 17,979 (23.2) |
 35 to < 40 years | 1350 (10.7) | 9811 (12.6) |
 40 + years | 393 ( 3.1) | 2488 ( 3.2) |
Race and ethnicity | ||
 NH-White | 2732 (21.6) | 17,617 (22.7) |
 NH-Black | 1962 (15.5) | 9419 (12.1) |
 NH-Asian | 562 ( 4.4) | 3286 ( 4.2) |
 NH-Native HI/PI | 186 ( 1.5) | 408 ( 0.5) |
 NH AI/AN | 51 ( 0.4) | 349 ( 0.4) |
 NH-other | 111 ( 0.9) | 641 ( 0.8) |
 Hispanic | 6620 (52.3) | 43,876 (56.5) |
 Unknown | 443 ( 3.5) | 2003 ( 2.6) |
Preferred spoken language | ||
 English | 7061 (55.7) | 42,710 (55.0) |
 Spanish | 4378 (34.6) | 29,338 (37.8) |
 Other | 1213 ( 9.6) | 5511 ( 7.1) |
 Unknown | 15 ( 0.1) | 40 ( 0.1) |
Region | ||
 OR | 3716 (29.3) | 21,089 (27.2) |
 CA | 3798 (30.0) | 29,885 (38.5) |
 WA | 1556 (12.3) | 4900 ( 6.3) |
 Other | 3586 (28.3) | 21,677 (27.9) |
 Unknown | 11 ( 0.1) | 48 ( 0.1) |
Income as a percent of FPL | ||
 0–50% | 4537 (35.8) | 23,006 (29.6) |
 > 50–100% | 2399 (18.9) | 18,062 (23.3) |
 > 100–200% | 1923 (15.3) | 15,299 (19.7) |
 > 200% | 549 ( 4.3) | 4539 ( 5.8) |
 Unknown | 3249 (25.6) | 16,693 (21.5) |
Insurance status | ||
 Uninsured | 1364 (10.8) | 5864 ( 7.6) |
 Public | 9224 (72.8) | 63,816 (82.2) |
 Private | 584 ( 4.6) | 7392 ( 9.5) |
 Unknown | 1495 (11.8) | 527 ( 0.7) |
Tobacco use (pre-pregnancy to early pregnancy) | ||
 Current | 327 ( 2.6) | 6750 ( 8.7) |
 Former | 202 ( 1.6) | 6163 ( 7.9) |
 Never | 1111 ( 8.8) | 37,646 (48.5) |
 Unknown | 11,027 (87.1) | 27,040 (34.8) |
Tobacco use (mid-late pregnancy) | ||
 Current | 936 ( 7.4) | 5663 ( 7.3) |
 Former | 1206 ( 9.5) | 9630 (12.4) |
 Never | 5698 (45.0) | 51,182 (66.0) |
 Unknown | 4827 (38.1) | 11,124 (14.3) |
Gestational age at first pregnancy encounter (weeks) | ||
 < 6 weeks | 1051 ( 8.3) | 20,772 (26.8) |
 6 to < 9 weeks | 570 ( 4.5) | 24,451 (31.5) |
 9 to < 14 weeks | 179 ( 1.4) | 19,908 (25.7) |
 14 to < 28 weeks | 7609 (60.1) | 10,020 (12.9) |
 28 + weeks | 3258 (25.7) | 2448 ( 3.2) |
Total number of pregnancy encounters in the second and third trimester | ||
 0 | 1695 (13.4) | 11 ( 0.0) |
 1–2 | 193 ( 1.5) | 4776 ( 6.2) |
 3–5 | 3950 (31.2) | 9438 (12.2) |
 6–10 | 5173 (40.8) | 34,240 (44.1) |
 11–15 | 1536 (12.1) | 25,633 (33.0) |
 16 +  | 120 ( 0.9) | 3501 ( 4.5) |