TABLE 1.
Maternal characteristics of women who were excluded from analysis due to incomplete data and of women who were included by pregnancy type
| Pregnancies without complete data (N = 2673) | Pregnancies with complete data | |||||||
| All (N = 10 327) | Normal pregnancies (N = 7504) | Maternal medical condition or adverse pregnancy outcome (N = 2823) | ||||||
| N with data | Mean (SD) or % | N | Mean (SD) or % | N | Mean (SD) or % | N | Mean (SD) or % | |
| Blood pressure | ||||||||
| SBP at 12 weeks (mmHg) | 2673 | 112.1 (12.77) | 10327 | 112.1 (12.12) | 7504 | 111.5 (11.83) | 2823 | 113.7 (12.72) |
| DBP at 12 weeks (mmHg) | 2673 | 65.7 (9.06) | 10327 | 65.7 (8.56) | 7504 | 65.2 (8.30) | 2823 | 66.8 (9.13) |
| SBP at 37 weeks (mmHg) | 2673 | 116.0 (13.21) | 10327 | 116.0 (12.92) | 7504 | 115.0 (12.22) | 2823 | 118.8 (14.22) |
| DBP at 37 weeks (mmHg) | 2673 | 70.0 (10.24) | 10327 | 69.9 (9.71) | 7504 | 69.0 (9.06) | 2823 | 72.4 (11.42) |
| Number of measuresa [median (IQR)] | 2673 | 10 (8, 11) | 10327 | 10 (9, 11) | 7504 | 10 (9, 12) | 2823 | 10 (8, 11) |
| Parity | ||||||||
| Nulliparous (%) | 794 | 45.4 | 4718 | 45.7 | 3372 | 44.9 | 1346 | 47.7 |
| Multiparous (%) | 954 | 54.6 | 5609 | 54.3 | 4132 | 55.1 | 1477 | 52.3 |
| Prepregnancy BMI | ||||||||
| Underweight (%) | 35 | 7.1 | 514 | 5.0 | 379 | 5.1 | 135 | 4.8 |
| Normal weight (%) | 351 | 71.2 | 7665 | 74.2 | 5703 | 76.0 | 1962 | 69.5 |
| Overweight (%) | 77 | 15.6 | 1566 | 15.2 | 1074 | 14.3 | 492 | 17.4 |
| Obese (%) | 30 | 6.1 | 582 | 5.6 | 348 | 4.6 | 234 | 8.3 |
| Smoking in pregnancy | ||||||||
| Never (%) | 1044 | 55.8 | 7076 | 68.5 | 5176 | 69.0 | 1900 | 67.3 |
| Prepregnancy/first trimester (%) | 309 | 16.5 | 1373 | 13.3 | 1000 | 13.3 | 373 | 13.2 |
| Throughout (%) | 518 | 27.7 | 1878 | 18.2 | 1328 | 17.7 | 550 | 19.5 |
aThis is the number of blood pressure measurements per woman after randomly selecting one measure per 2-week period of pregnancy for use in the multilevel models.