Table 1.

Trends Among Liveborn Neonates After Assisted Reproduction in the United States, 2000–2008

	2000	2001	2002	2003	2004	2005	2006	2007	2008	Relative Change, 2000– 2008 (%)	P for Trend
No. of liveborn neonates conceived after ART	34,861	40,608	45,765	48,748	49,320	51,968	54,638	57,571	61,430	76.2
No. of liveborn singleton neonates conceived after ART	16,350	18,896	21,614	23,710	24,893	26,559	28,652	29,938	31,888	95.0
% of ART births born as singletons at term with weight more than 2,500 g among all ART live births, total	38.6	38.9	39.4	40.5	41.4	41.5	42.7	42.3	42.5	10.1	<.01
Fresh, nondonor	38.4	38.7	39.1	40.1	41.2	41.5	43.0	42.3	42.2	9.9	<.01
Fresh, donor	32.5	32.3	31.8	33.5	33.7	32.6	34.1	33.2	33.8	3.9	.01
Frozen, nondonor	47.5	47.7	50.4	50.0	50.0	50.9	49.7	50.0	50.9	7.3	<.01
Frozen, donor	41.7	43.6	44.3	46.6	44.7	43.0	46.0	46.7	44.8	7.5	.09
% of singletons born at term with weight more than 2,500 g among all ART liveborn singletons, total	83.6	84.1	83.9	83.9	83.5	82.9	83.3	83.3	83.4	−0.2	<.01
Fresh, nondonor	84.1	84.6	84.4	84.3	83.9	83.6	84.0	83.8	83.9	−0.2	.04
Fresh, donor	81.1	81.3	80.6	81.1	81.3	79.7	81.0	80.4	81.1	0.0	.67
Frozen, nondonor	84.3	84.5	85.3	85.6	84.4	83.6	83.6	84.6	83.9	−0.5	.13
Frozen, donor	78.9	79.0	80.3	80.3	78.6	78.2	78.7	79.3	78.9	0.0	.62

ART, assisted reproductive technology.