Table 3.

Data relating to effectiveness and cost-effectiveness of applying metabolic GA estimation algorithm to different BW cohorts

BW range	Infants tested	Preterm births based on ultrasound (37-wk cutoff), n	Preterm births identified by basic algorithm (<38 wk), n	Number of preterm births identified by metabolic GA algorithm (<38 wk), n	Total cost excluding setup	Total cost including setup	Incremental cost per preterm infant identified vs basic algorithm (excluding setup)	Incremental cost per preterm infant identified vs basic algorithm (including setup)
2500–2600 g	117	14.0	5.3	9.3	$41,911	$62,376	$10,478	$15,594
2500–2700 g	219	16.0	5.3	10.0	$46,810	$67,276	$10,031	$14,416
2500–2800 g	364	29.3	5.3	14.7	$53,803	$74,268	$5765	$7957
2500–2900 g	493	33.3	5.3	16.0	$60,000	$80,465	$5625	$7544
2500–3000 g	689	37.3	5.3	16.0	$69,464	$89,929	$6512	$8431
2500–3100 g	777	37.3	5.3	16.0	$73,693	$94,158	$6909	$8827
2500–3200 g	871	38.7	5.3	17.3	$78,215	$98,680	$6901	$8707
2500–3300 g	951	40.0	5.3	17.3	$82,067	$102,532	$6839	$8544
2500–3400 g	984	40.0	5.3	17.3	$83,658	$104,124	$6972	$8677
2500–3500 g	1039	40.7	5.3	17.3	$86,338	$106,803	$7195	$8900
2500–3600 g	1060	42.0	5.3	17.3	$87,343	$107,808	$7279	$8984
2500–3700 g	1072	42.0	5.3	17.3	$87,929	$108,395	$7327	$9033
2500–3800 g	1078	42.0	5.3	17.3	$88,223	$108,688	$7352	$9057
2500–3900 g	1083	42.0	5.3	17.3	$88,432	$108,897	$7369	$9075
2500–4000 g	1096	42.0	5.3	17.3	$89,060	$109,525	$7422	$9127

BW, birthweight; GA, gestational age.

Coyle et al. Cost analysis of a gestational age algorithm. AJOG MFM 2021.