2.2. Study population and eligibility criteria
All studies that compared the relation between the mode of
delivery and neonatal mortality in preterm breech presentation
were eligible. Preterm delivery was defined as delivery between a
gestational age between 25+0 and 36+6 weeks. Studies that solely
used low-birth-weights as inclusion criterion were excluded from
this review. The primary outcome was neonatal mortality.
Secondary outcomes were neonatal morbidity (low Apgar scores,
respiratory distress syndrome, ventilatory support, low umbilical
artery pH, cerebral haemorrhage, infection, bronchopulmonary
dysplasia and survival without disability), and maternal morbidity
(duration of hospital recording and puerperal fever). Two
reviewers independently performed eligibility assessment.