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TABLE 2: 
Averages of NAA/Cr, mean isotropic ADC value, and mean FA value of control group and four patient groups
GroupNAA/CrPIsotropic ADC (×10−3 mm/2/s)PFAP
Controls1.31 ± 0.180.692 ± 0.0140.38 ± 0.02
1 (0–2 mo)1.28 ± 0.26.770.696 ± 0.016.060.38 ± 0.02.91
2 (3–5 mo)1.13 ± 0.10.040.724 ± 0.060<.010.34 ± 0.04<.01
3 (6–9 mo)1.23 ± 0.07.260.687 ± 0.018.520.39 ± 0.03.57
4 (10–12 mo)1.28 ± 0.09.780.710 ± 0.007.120.40 ± 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.