Table 2.

Temporal models of brain tissue growth.

	STV	CP	SP+IZ	DG	GMAT	VENT
Linear (y=b+ax)
R2†	0.95	0.94	0.95	0.96	—	0.53
Constant (b) (cm3)	−259.8473	−115.3931	−127.2964	−15.1449	—	−5.6391
Absolute growth rate‡ (a) (cm3/wk)	13.9555	5.8766	6.9138	0.8070	—	0.3945
Relative growth rate∫ (%/wk)	15.22	18.00	14.75	15.56	—	9.18
Quadratic (y=b+ax+cx2)
R2†	0.96	0.97	0.95	0.98	0.32	0.53
Constant (b) (cm3)	34.3612	138.5454	−103.9025	15.5028	−10.4941	−5.2904
Linear coefficient (a) (cm3/wk)	−9.1867	−14.0980	5.0737	−1.6037	1.0742	0.3671
Quadratic coefficient (c) (cm3/wk2)	0.4483	0.3869	0.0356	0.0467	−0.0215	0.0005
Absolute growth rate‡ (a+2cx) (cm3/wk)
at 22 GW (cm3/wk)	10.54	2.93	6.64	0.45	0.13	0.39
at 26 GW (cm3/wk)	14.12	6.02	6.93	0.82	−0.04	0.40
at 30 GW (cm3/wk)	17.71	9.12	7.21	1.20	−0.22	0.40
Exponential (y=m*enx)
R2†	0.96	0.97	0.93	0.98	—	0.53
Linear coefficient (m) (cm3/wk)	1.8131	0.3267	0.9499	0.1033	—	0.4400
Exponential coefficient (n) (wk−1)	0.1512	0.1766	0.1503	0.1509	—	0.0877
Absolute growth rate‡ (m*n*enx) (cm3/wk)
at 22 GW (cm3/wk)	7.63	2.81	3.89	0.43	—	0.27
at 26 GW (cm3/wk)	13.97	5.68	7.10	0.79	—	0.38
at 30 GW (cm3/wk)	25.59	11.52	12.95	1.44	—	0.54

^†Goodness of fit for model growth trajectories of each tissue zone

^‡Absolute volume gained per week for each tissue zone

^∫Percent volume gain relative to the average volume for each tissue zone