Comparison of Naturally Conceived and IVF-DZ Twins in the Netherlands Twin Registry: A Developmental Study

Table 4

SDS height and weight for ages 1 to 12 years for IVF/ICSI twins and matched NC twins.

	IVF/ICSI twins			Matched NC twins			𝑃 *
	𝑁	Mean	(SD)	𝑁	Mean	(SD)
Height
Age 1	2571	−.42	(1.0)	2568	−.51	(1.0)	0.018
Age 2	2443	−.25	(1.1)	2421	−.32	(1.1)	0.064
Age 3	2262	−.13	(1.1)	2194	−.18	(1.0)	0.249
Age 7	1584	−.09	(1.1)	1543	−.03	(1.0)	0.237
Age 10	857	−.05	(1.0)	757	.04	(1.0)	0.113
Age 12	857	.08	(1.1)	798	.10	(1.0)	0.822
Weight
Age 1	2614	−.44	(1.0)	2617	−.45	(1.0)	0.649
Age 2	2464	−.28	(1.0)	2451	−.22	(1.0)	0.133
Age 3	2261	−.26	(1.0)	2188	−.21	(1.0)	0.160
Age 7	1595	−.36	(1.1)	1526	−.29	(1.1)	0.151
Age 10	848	−.24	(1.0)	765	−.13	(1.0)	0.086
Age 12	843	−.21	(1.0)	794	−.11	(1.0)	0.086

Note: *𝑃 value based on tests comparing IVF and matched NC groups.