1) The study found that phototherapy induced significant hypocalcaemia in 43% of newborns receiving treatment, including 60% of preterm infants and 26% of full term infants. 2) Serum calcium levels fell significantly with phototherapy in both preterm and full term newborns but not in control groups not receiving phototherapy. 3) The study recommends calcium supplementation for newborns undergoing phototherapy treatment due to the risk of hypocalcaemia.