Study	Reason for exclusion
Amato 1988	Enrolled infants with RDS.
Amato 1989	Enrolled infants with RDS.
Bettendorf 2000	Enrolled infants after cardiac surgery.
Biswas 2003	Randomised trial of triiodothyronine and hydrocortisone versus placebo preterm infants <30 weeks gestation.
Cassio A 2003	Enrolled infants with congenital hypothyroidism.
Chowdhury 2001	Enrolled infants after cardiac surgery.
Eggermont 1984	Non‐randomized cohort comparison. Thyroxine given to 'sick' preterm infants and compared to a control group of 'non‐sick' preterm infants.
Schonberger 1981	Inadequate randomisation. Used alternation and included 5 infants who were not alternated as controls.
Selva 2002	Enrolled infants with congenital hypothyroidism.
Smith 2000	Enrolled infants < 32 weeks gestation, birthweight 600‐1500g, not on basis of thyroid function.
Valerio 2004	Enrolled infants < 28 weeks gestation not on basis of thyroid function.
van Wassenaer 1993	Not a randomised study. Used historical controls to compare the effect of three different doses of thyroxine on neonatal thyroid hormone levels. Dose was varied over 3 consecutive time periods (6, 8 and 10 micrograms/kg/day).
van Wassenaer 1997	Enrolled preterm infants 25‐29 weeks gestation not on basis of thyroid function.
Vanhole 1997	Enrolled infants <28 weeks gestation not on basis of thyroid function.