TABLE 2:

Averages of NAA/Cr, mean isotropic ADC value, and mean FA value of control group and four patient groups

Group	NAA/Cr	P	Isotropic ADC (×10−3 mm/2/s)	P	FA	P
Controls	1.31 ± 0.18		0.692 ± 0.014		0.38 ± 0.02
1 (0–2 mo)	1.28 ± 0.26	.77	0.696 ± 0.016	.06	0.38 ± 0.02	.91
2 (3–5 mo)	1.13 ± 0.10	.04	0.724 ± 0.060	<.01	0.34 ± 0.04	<.01
3 (6–9 mo)	1.23 ± 0.07	.26	0.687 ± 0.018	.52	0.39 ± 0.03	.57
4 (10–12 mo)	1.28 ± 0.09	.78	0.710 ± 0.007	.12	0.40 ± 0.03	.10

Note.—NAA/Cr indicates N-acetylaspartate to creatine ratio; ADC, apparent diffusion coefficient; FA, fractional anisotropy. Values are expressed as mean ± SD. P values were obtained by comparison between the values of each patient group versus those of the control group.