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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} <.001^{^b}
6–20 0.63/0.60–0.67 15 .005,^{^c} <.001^{^d}
21–50 0.70/0.65–0.78 21 .015^{^e}
Older than 50 0.81/0.72–0.86 22 .001^{^f}
↵a Comparison between 0 to 5- and 6 to 20-year-old subjects.
↵b Comparison between 0 to 5- and 21 to 50-year-old subjects.
↵c Comparison between 6 to 20- and 21 to 50-year-old subjects.
↵d Comparison between 6 to 20- and older than 50-year-old subjects.
↵e Comparison between 21 to 50- and older than 50-year-old subjects.
↵f Comparison between 0 to 5- and older than 50-year-old subjects.

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