Table 1.

Age distribution of all subjects in each group

Group	Case	Age	Mean	SD
Young group	119 males	18–39	29.63	6.25
	78 females	18–39	29.31	6.21
Middle-aged group	109 males	40–59	48.4	5.4
	89 females	40–59	51.21	5.3
Elderly group	95 males	≥ 60	78.18	7.75
	105 females	≥ 60	70.16	7.4