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Table 2 Bias assessment in a systematic review/meta-analyses on the safest mode of delivery for extremely preterm cephalic/non-cephalic twin pairs

From: What is the safest mode of delivery for extremely preterm cephalic/non-cephalic twin pairs? A systematic review and meta-analyses

Study ID Author, Year, Country

Total

Selection

Outcome

Comparability

Representativeness of the exposed cohort

Selection of the non- exposed cohort

Assessment of outcome

Adequacy of follow up of cohorts

Emergent caesarean for fetal distress

Clinical Chorioamnionitis

Outborn Status

ANCS

Boukerrou, 2011 France

3/8

★

★

★

–

–

–

–

–

Barzilay, 2015 Israel

3/8

★

★

★

–

–

–

–

–

Bricelj, 2016 Slovenia

3/8

★

★

★

–

–

–

–

–

  1. ANCS antenatal corticosteroids, ★ = 1 point awarded, “- “= no points awarded. Assessed risk of bias of observational studies using a modified Newcastle Ottawa Scale