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Table 2: Brain parenchymal fraction 5–20 years
Age (yr) Total Mean 5–10 Years (P Value) 10–15 Years (P Value)
Male 
 5–10 18 0.872 
 10–15 20 0.879 NS 
 15–20 72 0.891 <.001 .004
Female 
 5–10 12 0.874 
 10–15 20 0.877 NS 
 15–20 70 0.889 .003 .003
Note:—NS indicates not significant.
Age (yr)	Total	Mean	5–10 Years (P Value)	10–15 Years (P Value)
Male
5–10	18	0.872
10–15	20	0.879	NS
15–20	72	0.891	<.001	.004
Female
5–10	12	0.874
10–15	20	0.877	NS
15–20	70	0.889	.003	.003