Table 3:

Comparison of Cho/NAA among different age groups

Age Groups (yr)	Median/Quartile	No.	P Value
0–5	1.01/0.84–1.43	20	<.001,a <.001b
6–20	0.63/0.60–0.67	15	.005,c <.001d
21–50	0.70/0.65–0.78	21	.015e
Older than 50	0.81/0.72–0.86	22	.001f

^aComparison between 0 to 5- and 6 to 20-year-old subjects.

^bComparison between 0 to 5- and 21 to 50-year-old subjects.

^cComparison between 6 to 20- and 21 to 50-year-old subjects.

^dComparison between 6 to 20- and older than 50-year-old subjects.

^eComparison between 21 to 50- and older than 50-year-old subjects.

^fComparison between 0 to 5- and older than 50-year-old subjects.