Table 1.
Logistic Regression Model of C-Section Risk (ρ): All Doctors
| Coefficient | SE | Marginal Effect | |
|---|---|---|---|
| Age < 20 | −.337 | .013 | −.075 |
| Age ≥ 25 and < 30 | .262 | .008 | .058 |
| Age ≥ 30 and < 35 | .434 | .008 | .096 |
| Age ≥ 35 | .739 | .009 | .164 |
| 2nd birth | −1.347 | .007 | −.298 |
| 3rd birth | −1.645 | .009 | −.364 |
| 4th or higher birth | −2.140 | .012 | −.474 |
| Previous C-section | 3.660 | .008 | .810 |
| Previous large infant | .139 | .029 | .031 |
| Previous preterm | −.293 | .025 | −.065 |
| Multiple birth | 2.879 | .014 | .638 |
| Breech | 3.353 | .016 | .742 |
| Placenta previa | 3.811 | .054 | .844 |
| Abruptio placenta | 2.048 | .030 | .454 |
| Cord prolapse | 1.761 | .047 | .390 |
| Uterine bleeding | .026 | .035 | .006 |
| Eclampsia | 1.486 | .096 | .329 |
| Chronic hypertension | .745 | .025 | .165 |
| Pregnancy hypertension | .639 | .013 | .142 |
| Chronic lung condition | .064 | .014 | .014 |
| Cardiac condition | −.121 | .020 | −.027 |
| Diabetes | .558 | .011 | .124 |
| Anemia | .131 | .018 | .029 |
| Hemoglobinopathy | .116 | .047 | .026 |
| Herpes | .461 | .024 | .102 |
| Other STD | .052 | .017 | .012 |
| Hydramnios | .616 | .018 | .136 |
| Incompetent cervix | .043 | .035 | .010 |
| Renal disease | −.024 | .031 | −.005 |
| Rh sensitivity | −.045 | .040 | −.010 |
| Other risk factor | .276 | .006 | .061 |
| Constant | −1.414 | .007 | −.313 |
| Pseudo R2 | .32 |
Note.—Number of observations = 1,169,654.