Intervention andcomparator cost durations were life long. For neonatal intensive care unit for infants with birth weight 500-999g: incremental cost per life saved was 125000(discounted at 5%); incremental cost per life-year gained was 11400 (costs and benefits discounted at 5%, with a value of 6240 when costs and benefits were not discounted. The incremental cost per QALY: was 27400 (costs and benefits discounted at 5%), with a value of11100 when costs and benefits were not discounted. The range of incremental cost per QALY a lowest value of 17700,and highest value of55700. For neonatal intensive care unit for infants with birth weight 1000-1499g: incremental cost per life saved was 72800 (discounted at 5%); incremental cost per life-year gained was 3550 (costs and benefits discounted at 5%), with a value of1100 when costs and benefits not discounted. The incremental cost per QALY was 3910 (costs and benefits discounted at 5%), with a value of 1100 when costs and benefits were not discounted. The range of incremental cost per QALY was a lowest value of1200, and highest value of6100. The sensitive parameters were discount rate; life expectancy; loss to follow-up; and utility values.