Table 1.
Matched unadjusted demographic and health related characteristics and preterm delivery among women with a documented delivery from a large healthcare system’s electronic health record from April 1, 2012 to September 30, 2019 (n = 2158).
| Parameter | Total n (%)/Mean ± SD | Preterm Delivery n (%)/Mean ± SD | No preterm delivery n (%)/Mean ± SD | Odds ratio 95% (CI) | χ2 | P |
|---|---|---|---|---|---|---|
| All | 2158 (100.0) | 280 (13.0) | 1878 (87.0) | |||
| Age at delivery (ranges 18–44) | 29.9 ± 5.6 | 29.9 ± 6.1 | 29.9 ± 5.6 | 1.00 (1.00–1.02) | 0.01 | 0.9149 |
| Race/ethnicity | ||||||
| Hispanic/Latina | 201 (9.6) | 27 (9.8) | 174 (9.6) | 1.39 (0.88–2.21) | 0.04 | 0.8262 |
| Non-Hispanic/Latina Black | 214 (10.2) | 38 (13.8) | 176 (9.7) | 1.94 (1.28–2.93) | 3.92 | 0.0478 |
| Othera | 813 (38.8) | 123 (44.8) | 690 (37.9) | 1.61 (1.20–2.16) | 1.10 | 0.2948 |
| Non-Hispanic/Latina White | 869 (41.4) | 87 (31.6) | 782 (42.9) | – | ||
| Marital status | ||||||
| Single | 1017 (47.3) | 157 (56.3) | 860 (45.9) | 1.58 (1.22–2.06) | 2.06 | 0.1511 |
| Divorced/separated/widowed | 89 (4.1) | 13 (4.7) | 76 (4.1) | 1.49 (0.80–2.78) | 0.31 | 0.5804 |
| Married | 1046 (48.6) | 109 (39.1) | 937 (50.1) | – | ||
| Body Mass Index at delivery | 32.6 ± 7.6 | 31.8 ± 7.6 | 32.1 ± 7.6 | 0.98 (0.97–0.99) | 3.38 | 0.0540 |
| ≥1 previous pregnancyb | ||||||
| No | 1986 (92.0) | 258 (92.1) | 1728 (92.0) | 1.02 (0.64–1.63) | 0.01 | 0.9259 |
| Yes | 172 (8.0) | 22 (7.9) | 150 (8.0) | – | ||
| Health insurance | ||||||
| Public | 484 (22.4) | 71 (25.4) | 413 (22.0) | 1.18 (0.88–1.58) | 2.15 | 0.2528 |
| No insurance | 211 (9.8) | 22 (7.9) | 189 (10.1) | 0.83 (0.53–1.31) | 1..31 | 0.2528 |
| Private | 1463 (67.8) | 187 (66.8) | 1276 (67.9) | – | ||
| Substance-related diagnosis | ||||||
| Yes | 1079 (50.0) | 171 (61.1) | 908 (48.4) | 1.66 (1.28–2.14) | 15.0 | 0.0001 |
| No | 1079 (50.0) | 109 (38.9) | 970 (51.7) | – | ||
| Serious mental illness | ||||||
| Yes | 163 (7.6) | 29 (10.4) | 134 (7.1) | 1.50 (0.98–2.28) | 3.50 | 0.0614 |
| No | 1995 (92.5) | 251 (89.6) | 1744 (92.9) | – | ||
| Non-serious mental illness | ||||||
| Yes | 709 (32.9) | 100 (35.7) | 609 (32.4) | 0.97 (0.76–1.25) | 0.054 | 0.8165 |
| No | 1449 (67.1) | 180 (64.3) | 1269 (67.6) | – | ||
| Preexisting health condition | ||||||
| Yes | 1078 (19.9) | 175 (62.5) | 903 (48.1) | 1.78 (1.38–2.30) | 19.27 | <0.0001 |
| No | 1080 (50.1) | 105 (37.5) | 975 (51.9) | – |
Notes: Matched age at delivery by non-preterm delivery: n = 1878, median = 30, ranges = 18–44. Matched BMI at delivery by preterm delivery: n = 280, median = 31.4, ranges = 18.9–71.5. Matched BMI at delivery by non-preterm delivery: n = 1878, median = 32.7, ranges = 14.4–101.2.). Variable totals may not sum to column totals due to missing data.
Other race/ethnicity includes American Indian/Alaskan Native (n = 15), Asian/Pacific Islander (n = 139), and other race or mixed race/ethnicity (n = 659).
≥ 1 previous pregnancy at ≥20 weeks’ gestation ending in a livebirth or stillbirth. Matched age at delivery by preterm delivery: n = 280, median = 30, ranges = 18–42.