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Table 1 Factors affecting perinatal mortality, binomial regression analysis

From: Perinatal outcomes in Finnish twins: a retrospective study

Variable Estimate OR OR CI p-value
Model 1*
 Twin B vs twin A 0.312 1.366 1.054–1.774 0.019
 Advancing time −0.038 0.963 0.951–0.975 < 0.001
  < 1500 g 0.008 1.008 1.002–1.015 0.019
 1500-2499 g −0.002 0.998 0.996–1.001 0.277
  ≥ 2500 g −0.000 1.000 0.998–1.001 0.675
Model 2
 Twin B vs twin A 0.230 1.258 1.089–1.455 0.002
 Advancing time −0.033 0.967 0.956–0.979 < 0.001
  < 1500 g 0.010 1.010 1.003–1.017 0.006
 NICU stay −0.002 0.998 0.997–1.000 0.052
Model 3
 Twin B vs twin A 0.307 1.359 1.177–1.571 < 0.001
 Advancing time −0.042 0.959 0.948–0.969 < 0.001
 Delivery: Vaginal attempt −0.001 0.999 0.997–1.002 0.546
 Delivery: Cesarean section −0.002 0.998 0.996–1.001 0.250
 Delivery: Combination delivery 0.002 1.002 0.994–1.010 0.622
  1. *Similar results were obtained when weight categories were analyzed as shares