. Author manuscript; available in PMC: 2011 Jul 28.

Published in final edited form as: Twin Res Hum Genet. 2011 Jun;14(3):268–276. doi: 10.1375/twin.14.3.268

Table 4.

Singleton-MZ-DZ comparison of growth trajectory in first 10 weeks of life

Brain Volumes	Group	Increase per week	Percent increase over 10 weeks
Total Gray Matter	Singleton	9653 mm³	16%
	MZ	12887 mm³	17%
	DZ	8449 mm³	14%
Cortical Gray Matter	Singleton	7735 mm³	15%
	MZ	10458 mm³	17%
	DZ	6559 mm³	14%
Parietal Gray Matter	Singleton	1813 mm³	14%
	MZ	3073 mm³	17%
	DZ	1757 mm³	14%

Calculations based on regression equations applied to the period from 280 days (40 weeks) gestational age to 350 days (50 weeks) gestational age.