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Table 4 Primary outcome (delivery < 37 weeks) and gestational age at delivery, sub-grouped by timing and indication of procedure

From: Pregnancy outcome following fetal reduction from dichorionic twins to singleton gestation

  Timing of Fetal Reduction Indication for Fetal Reduction Non-reduced Twins
(n = 222)
P values
1st Trimester
(n = 40)
2nd/3rd Trimester
(n = 58)
Elective
(n = 20)
Risk Factors
(n = 10)
Anomalies
(n = 66)
(a) (b) (c) (d) (e)
Gestational age at procedure, weeks 12.7 ± 0.62 20.3 ± 5.4 13.0 ± 0.6 13.1 ± 1.6 21.3 ± 6.0
Gestational age at delivery, weeks 37.3 ± 3.1 36.4 ± 2.9 37.7 ± 2.2 35 ± 4.5 36.7 ± 2.9 35.3 ± 2.6 <.0001 0.006 0.0002 0.797 0.0003
Delivery < 37 weeks 12 (30.0%) 26 (46.4%) 5 (25.0%) 7 (70.0%) 26 (40.6%) 143 (64.4%) 0.003 0.124 0.007 0.402 0.026
  1. Data presented as mean ± standard deviation or number (%)
  2. p-value (a) - compares reduction at 1st trimester to non-reduced twins, adjusted to parity and conception
  3. p-value (b) - compares reduction at 2nd/3rd trimester to non-reduced twins, adjusted to parity and conception
  4. p-value (c) - compares reduction due to elective reasons to non-reduced twins, adjusted to parity and conception
  5. p-value (d) - compares reduction due to risk factors for preterm delivery to non-reduced twins, adjusted to parity and conception
  6. p-value (e) - compares reduction due to anomalies to non-reduced twins, adjusted to parity and conception