The review found no eligible studies for this question.
Vaginal progesterone showed no clear difference in infant birthweight less than 2500 g compared with no treatment or placebo (moderate certainty).
Intramuscular (IM) progesterone showed no clear difference in infant birthweight less than 2500 g compared with no treatment or placebo (moderate certainty).
Plastic wrap or bag probably leads to lower hypothermia on admission to NICU: core body temperature < 36.5°C or… compared with routine care (moderate certainty).
Plastic wrap or bag probably leads to higher hyperthermia on admission to NICU: core body temperature > 37.5°C compared with routine care (moderate certainty).
Plastic wrap or bag showed no clear difference in major brain injury (within hospital stay) compared with routine care (moderate certainty).
Plastic wrap or bag probably leads to lower pulmonary haemorrhage (within hospital stay) compared with routine care (moderate certainty).
Plastic wrap or bag showed no clear difference in mortality (death within hospital stay or at 6 months' corrected… compared with routine care (moderate certainty).
Early inhaled steroids (< 2 weeks) showed no clear difference in CLD at 36 weeks' PMA oxygen dependency at 36 weeks' PMA compared with placebo (among all randomised) (moderate certainty).
Early inhaled steroids (< 2 weeks) probably leads to lower death by, or CLD at, 36 weeks' PMA Death or oxygen dependency at 36… compared with placebo (among all randomised) (moderate certainty).
Early inhaled steroid (< 2 weeks) probably leads to lower CLD at 36 weeks' PMA compared with placebo (among survivors) (moderate certainty).
Cerclage showed no clear difference in all perinatal losses compared with no cerclage (moderate certainty).
Cerclage showed no clear difference in serious neonatal morbidity compared with no cerclage (low certainty).
Cerclage showed no clear difference in baby discharged home healthy compared with no cerclage (moderate certainty).
Cerclage showed no clear difference in neonatal deaths before discharge compared with no cerclage (low certainty).
Summary of findings table for oral immunoglobulin showed no clear difference in definite necrotizing enterocolitis (NEC) during study period compared with control (low certainty).
It is very uncertain whether summary of findings table for oral immunoglobulin changes definite necrotizing enterocolitis (NEC) during study period ‐ IgA/IgG compared with control (very low certainty).
Summary of findings table for oral immunoglobulin showed no clear difference in definite necrotizing enterocolitis (NEC) during study period ‐ IgG compared with control (low certainty).
It is very uncertain whether summary of findings table for oral immunoglobulin changes definite NEC after study period compared with control (very low certainty).
It is very uncertain whether summary of findings table for oral immunoglobulin changes NEC‐related surgery during study period compared with control (very low certainty).