Table 3.
Final Hierarchical Classification: Derivation and Validation
| Clinical Classification | Derivation Set: Number of Patients Undergoing Elective Primary Cesarean (%) | Validation Set: Number of Patients Undergoing Elective Primary Cesarean (%) |
|---|---|---|
| Malpresentation | 5,641 (57.10%) | 5,682 (58.10%) |
| Antepartum bleed | 1,062 (10.75%) | 917 (9.37%) |
| Herpes | 549 (5.56%) | 530 (5.42%) |
| Severe hypertension | 391 (3.96%) | 397 (4.06%) |
| Other uterine scar | 110 (1.11%) | 116 (1.12%) |
| Multiple gestation | 226 (2.29%) | 212 (2.17%) |
| Macrosomia | 446 (4.51%) | 442 (4.52%) |
| Unengaged fetal head | 167 (1.70%) | 138 (1.41%) |
| Maternal soft tissue disorder | 151 (1.53%) | 164 (1.68%) |
| Hypertension, other | 282 (2.85%) | 315 (3.22%) |
| Preterm gestation | 164 (1.66%) | 129 (1.32%) |
| Fetal congenital anomaly | 11 (0.11%) | 19 (0.19%) |
| Unspecified | 680 (6.88%) | 723 (7.39%) |
| Total | 9,880 (4.27%) | 9,784 (4.22%) |
Derived and confirmed on a random division of all data: n = 463,196. n = 231,430 primary cesarean deliveries for derivation dataset and n = 231,766 primary cesarean deliveries for validation dataset.