Table 2

		Vertical diameter	Horizontal diameter	P-value
		Mean (SD)	Mean (SD)	P-value
Sex	Male	2.95 (1.038)	3.65 (1.264)	0.213^a
Sex	Female	2.81 (0.962)	3.54 (1.226)	0.446^a
Age group	Young adults	2.98 (1.065)	3.72 (1.31)	0.046^b
Age group	Middle-aged adults	2.77 (0.921)	3.46 (1.155)	0.049^b

^aNo statistically significant difference at the level P < 0.05, independent sample t-test.
^bStatistically significant difference at the level P < 0.05, independent sample t-test.
SD = standard deviation.