Inclusion criteria were: (1) RCT or quasi-RCT study; (2) study population of preterm infants
< 37 weeks gestational age); (3) intervention: plastic wraps used immediately after birth and/or after during the neonatal intensive care unit (NICU); involved use of transparent plastic wraps and bags made of low density polyethylene or linear low density polyethylene or polyvinylidene chloride; (4) the control intervention comprising of any form of routine thermal care;(5) Infants’ temperatures were measured on admission to the NICU (baseline temperature),
and/or after having been stabilized in the NICU (post-stabilization temperature).