TABLE 3.
TRAJECTORIES FOR PREDICTORS BY GESTATIONAL DURATION: RISK OF FETAL LOSS RELATIVE TO BASELINE CATEGORYa
| Weeks Since Onset of Last Normal Menses |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| 10-12 | 13-16 | 17-20 | 21-24 | 25-28 | 29-32 | 33-36 | 37-38 | 39-41 | |
| Age at Conception | |||||||||
| 15-17 | 0.323 | 0.363 | 0.397 | 0.526 | 0.519 | 0.395 | 0.579 | 0.344 | 0.403 |
| 18-19 | 0.766 | 0.736 | 0.770 | 0.840 | 0.915 | 0.664 | 0.705 | 0.749 | 1.052 |
| 20-24 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
| 25-29 | 1.325 | 1.290 | 1.495 | 1.401 | 1.088 | 1.416 | 1.214 | 1.199 | 1.324 |
| 30-34 | 1.669 | 1.726 | 2.208 | 1.701 | 1.466 | 1.811 | 1.383 | 1.284 | 1.649 |
| 35-39 | 2.189 | 2.436 | 3.381 | 2.683 | 2.067 | 1.849 | 2.203 | 1.734 | 2.698 |
| Previous Births | |||||||||
| 0 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
| 1 | 0.962 | 0.978 | 0.920 | 0.820 | 0.574 | 0.919 | 0.748 | 0.765 | 0.739 |
| 2 | 0.811 | 0.924 | 1.177 | 0.813 | 0.715 | 1.134 | 0.562 | 0.540 | 0.648 |
| 3 | 0.633 | 0.950 | 1.136 | 0.750 | 0.778 | 0.879 | 0.562 | 0.610 | 0.807 |
| Marital Status | |||||||||
| Single | 3.905 | 3.419 | 2.280 | 2.079 | 1.756 | 1.800 | 1.860 | 1.175 | 1.258 |
| Married | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
| Divorced | 1.394 | 1.766 | 1.769 | 1.698 | 1.058 | 0.720 | 0.988 | 0.600 | 1.004 |
| Educational Level | |||||||||
| Basic | 1.335 | 1.632 | 2.088 | 2.161 | 2.728 | 1.250 | 1.242 | 1.025 | 1.336 |
| Vocational | 1.029 | 1.016 | 1.023 | 1.283 | 1.406 | 1.177 | 1.295 | 1.307 | 1.547 |
| Higher education | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
| Labor Force Attachment | |||||||||
| No occupation | 4.144 | 4.959 | 5.151 | 5.477 | 4.387 | 1.754 | 1.310 | 1.281 | 0.950 |
| With occupation | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 | 1.000 |
a
For each factor, the relative risks have been calculated by multivariate indirect standardization, with the selected covariate in interaction with gestational duration and with the remaining covariates in complete interaction as a control term. (Using only main effects of the remaining covariates produces essentially the same effects.) Each panel represents a separate model.