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