TABLE 3.
A prediction model for delivery with pre‐eclampsia or superimposed pre‐eclampsia that included dietary calcium intake as a predictor variable
| Coefficients | 95% confidence interval | |
|---|---|---|
| Maternal age, years | –.1 | –.2 to –.01 |
| Body mass index, kg/m2 | –.06 | –.1 to –.01 |
| Chronic hypertension | –2.4 | –3.0 to –1.8 |
| Diabetes mellitus (types 1 and 2) | –1.2 | –3.0 to .5 |
| Systemic lupus erythematosus | –5.4 | –8.1 to –2.7 |
| Family history of HDP | –1.2 | –2.0 to –.4 |
| Parity | ||
| Parous with previous HDP | –3.2 | –4.1 to –2.4 |
| Parous with no previous HDP | –.7 | –1.3 to –.1 |
| Inter‐birth interval, years | –.1 | –.2 to –.01 |
| Last delivery gestational age, weeks | .5 | .3 to .8 |
| Conception by in vitro fertilization | –.02 | –.7 to .6 |
| log MoM of the MAP | –16.9 | –20.8 to –12.9 |
| Calcium intake, 100 mg/day | –.2 | –.3 to –.06 |
| Constant | 46.5 | 45.8 to 47.1 |
Notes: The broken‐stick model was used for maternal age, gestational age of last delivery in weeks, and dietary calcium intake. Maternal age minus 35 was included as a covariate if the maternal age was >35. Gestational age of last delivery minus 37 was included if delivery was before week 37. Dietary calcium intake minus 600 was included if daily consumption was <600 mg. Body mass index and interval were centralized to their means (21.4 and 1.8 kg/m2, respectively).
Abbreviations: HDP, hypertensive disorders of pregnancy; log MoM, log10 transformed multiple of the median; MAP, mean arterial pressure.