Table 1.
Baseline characteristics of the Expect Study cohorts I and II
| Baseline characteristics <16 weeks of gestation | Expect Study I care‐as‐usual cohort (n = 2614) | Expect Study II risk‐based care cohort (n = 714) |
|---|---|---|
| Age, years; mean ± SD | 30.2 ± 3.9 | 30.8 ± 4.0 |
| Ethnicity | ||
| Caucasian; n (%) | 2533 (96.9) | 698 (97.8) |
| Other; n (%) | 81 (3.1) | 16 (2.2) |
| Educational level | ||
| Primary or secondary; n (%) | 1194 (45.7) | 273 (38.2) |
| Tertiary level of education; n (%) | 1420 (54.3) | 441 (61.8) |
| Body mass index, kg/m2; mean ± sd | 24.2 ± 4.3 | 24.8 ± 4.6 |
| Smoking during pregnancy | ||
| Yes | 319 (12.2) | 32 (4.5) |
| No | 2137 (81.8) | 682 (95.5) |
| Chronic hypertension | 28 (1.1) | 16 (2.2) |
| Conception | ||
| Natural; n (%) | 2440 (93.3) | 644 (90.2) |
| Ovulation induction; n (%) | 93 (3.6) | 35 (4.9) |
| In vitro fertilization; n (%) | 81 (3.1) | 35 (4.9) |
| Obstetric history | ||
| Nulliparous; n (%) | 1326 (50.7) | 360 (50.4) |
| Prior PE; n (%) | 72 (2.8) | 38 (5.3) |
| No prior PE; n (%) | 1216 (46.5) | 316 (44.3) |
| Family history of PE; n (%) | 131 (5.0) | 36 (5.0) |
| Counseling of PE risk | ||
| by midwife; n (%) | NA | 523 (73.2) |
| by obstetrician; n (%) | NA | 191 (26.8) |
| Estimated PE risk %; median (interquartile range) | 2.5 (1.0‐3.6) | 2.7 (1.1‐4.2) |
| Increased PE risk; n (%) | 974 (37.2) | 306 (42.9) |
| Estimated PE risk % for women identified with an increased risk; median (interquartile range) | 4.2 (3.4‐5.8) | 4.7 (3.6‐6.8) |
Abbreviations: NA, not available; PE, preeclampsia; SD, standard deviation.