| Table IV. Preterm delivery according to gestational order. RLA, 1990-2009. | ||||
| Singleton | Twin | Triplets | ≥Quadruplets | |
|---|---|---|---|---|
| 20-32 WA | 1,172 (2%) | 617 (8%) | 247 (25%) | 38 (54%) |
| 33-36 WA | 5,891 (12%) | 3750 (49%) | 653 (65%) | 24 (34%) |
| ≥37 WA | 40,110 (85%) | 3,225 (42%) | 98 (10%) | 9 (12%) |
| total | 47,173 | 7,592 | 998 | 71 |