TABLE 1.
Patient demographics and clinical characteristics
| Characteristic | Term delivery (n = 29 272) | Preterm delivery (n = 2278) | p value |
|---|---|---|---|
| Maternal age, y | 31.6 ± 5.3 | 32.1 ± 5.7 | <0.001 |
| ≥35 | 8760 (29.9) | 815 (35.8) | <0.001 |
| Race and ethnicity | |||
| Non‐Hispanic White | 13 172 (45.0) | 757 (33.2) | <0.001 |
| Non‐Hispanic Black | 3385 (11.6) | 459 (20.1) | |
| Hispanic/Latino | 5403 (18.5) | 473 (20.8) | |
| Other | 7312 (25.0) | 589 (25.9) | |
| Parity | |||
| 0 | 12 939 (44.7) | 1055 (46.9) | <0.001 |
| 1 | 9482 (32.7) | 634 (28.2) | |
| 2 | 4127 (14.3) | 347 (15.4) | |
| ≥3 | 2413 (8.3) | 214 (9.5) | |
| History of preterm birth | 1197 (4.1) | 314 (14.0) | <0.001 |
| BMI, kg/m2 | 30.1 (26.9–34.0) | 30.7 (27.1–35.5) | <0.001 |
| ≥30 | 14 190 (50.9) | 1,222 (56.5) | <0.001 |
| Married | 20 891 (73.8) | 1357 (63.4) | <0.001 |
| Public health insurance | 10 653 (36.4) | 917 (40.3) | <0.001 |
| Medical co‐morbidities | |||
| Chronic hypertension | 898 (3.1) | 284 (12.532) | <0.001 |
| Diabetes, pregestational or gestational | 2960 (10.1) | 346 (15.2) | <0.001 |
| Asthma or other chronic pulmonary disease | 1825 (6.2) | 226 (9.9) | <0.001 |
| Hypertensive disorder of pregnancy | 3240 (11.1) | 770 (33.8) | <0.001 |
| SARS‐CoV‐2 infection a | 2262 (7.7) | 211 (9.3) | <0.009 |
Data are median (interquartile range), n (%), and mean ± SD.
Missing data for 4.7% of BMI, 3.5% of marital status, 1.1% of parity, and 1.1% of history of preterm birth.
Abbreviations: BMI, body mass index; SARS‐CoV‐2, severe acute respiratory syndrome coronavirus 2.
a
Either at delivery or resolved prenatal infection.