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Table 2 Comparison of gestational age at delivery between both groups

From: The effect of early administration of rectal progesterone in IVF/ICSI twin pregnancies on the preterm birth rate: a randomized trial

  Progesterone group N = 102 Placebo group N = 97  
Early fetal loss (n) 2 (2%) 4 (4.1%) 0.372
Gestational age at delivery (weeks) 34.7 ± 3.6 34.5 ± 4.5 0.626
Term births (n) > 37 weeks 25 (24.5%) 27 (27.8%) 0.594
Preterm births (n) < 37 weeks 75 (73.5%) 66 (68%) 0.551
< 34 weeks 21 (20.6%) 21 (21.6%) 0.649
< 32 weeks 9 (8.8%) 12 (12.4%) 0.46
< 30 weeks 5 (4.9%) 7 (7.2%) 0.516
< 28 weeks 5 (4.9%) 3 (3.1%) 0.555
  1. Data is expressed either as a mean ± SD or n (%)
  2. Preterm births are all spontaneous births, except for two patients in the progesterone group who had iatrogenic termination < 37 weeks because of severe pre-eclampsia with no neonatal morbidity or mortality