Table 1. Study Subject Information According to High-Risk Group.
| Diabetes (n = 194) | Chronic Hypertension (n = 313) | Multifetal Gestation (n = 234) | Previous Preeclampsia (n = 252) | |||||
| Characteristic | Control (n = 148) | Preeclampsia (n = 46) | Control (n = 235) | Preeclampsia (n = 78) | Control (n = 195) | Preeclampsia (n = 39) | Control (n = 202) | Preeclampsia (n = 50) |
| Maternal age (years) | 26±6 | 26±6 | 29±7 | 30±6 | 25±6 | 26±7 | 24±5 | 25±6 |
| Body-mass index (kg/m2) | 28±7 | 27±8 | 33±9 | 34±9 | 26±7 | 29±8 | 28±8 | 30±9 |
| Gestational ageat study entry (weeks) | 17±3 | 19±4 | 19±4 | 19±4 | 21±3 | 20±4 | 20±4 | 19±4 |
| Primigravida, no. (%) | 46 (31) | 20 (43) | 49 (21) | 16 (21) | 53 (27) | 19 (49)* | --- | --- |
| Race or ethnic group, no. (%) | * | |||||||
| Black | 42 (28) | 19 (41) | 148 (63) | 49 (63) | 92 (47) | 22 (56) | 153 (76) | 37 (74) |
| White | 91 (61) | 27 (59) | 65 (28) | 18 (23) | 78 (40) | 14 (36) | 42 (21) | 13 (26) |
| Hispanic/Other | 15 (10) | 0 (0) | 22 (9) | 11 (14) | 25 (13) | 3 (8) | 7 (3) | 0 (0) |
| Average blood pressure at entry (mmHg) | 112±14/67±10 | 118±15*/70±12 | 126±15/76±12 | 132±13*/81±11* | 111±11/64±9 | 116±9*/67±9* | 110±11/65±10 | 115±12*/70±9* |
| Smoked during pregnancy,no. (%) | 34 (23) | 5 (11) | 40 (17) | 13 (17) | 28 (14) | 3 (8) | 31 (15) | 9 (18) |
| Aspirin treatment,no. (%) | 78 (53) | 18 (39) | 112 (48) | 44 (56) | 101 (52) | 14 (36) | 102 (50) | 23 (46) |
| Gestational age at delivery (weeks) | 37±2 | 36±2 | 38±2 | 36±3* | 35±3 | 35±2 | 38±2 | 37±2* |
| Gestational age at delivery <37 weeks | 46 (31) | 23 (50)* | 46 (20) | 35 (45)* | 122 (63) | 28 (72) | 30 (15) | 16 (32)* |
| Onset of preeclampsia before 37 weeks' gestation, no. (%) | --- | 30 (65) | --- | 52 (67) | --- | 27 (69) | --- | 19 (38) |
| Infant birth weight (grams) | 3288±782 | 3162±943 | 3120±689 | 2797±907* | 2334±607 | 2461±458 | 3189±642 | 3135±729 |
Data are mean ± standard deviation or N (%).
*: p<0.05 compared to group appropriate control.