Table 2. Comparison of FA-WALA ridge distances (mm) in the Peruvian sample by sex, arch side and age groups.

Tooth	Sex					Arch side					Age (in years)
	Female (n=28)		Male (n=37)		p*	Left (n=65)		Right (n=65)		p**	13-17 (n=20)		18-25 (n=45)		p*
	$\overline{\text{x}}$	SD	$\overline{\text{x}}$	SD		$\overline{\text{x}}$	SD	$\overline{\text{x}}$	SD		$\overline{\text{x}}$	SD	$\overline{\text{x}}$	SD
1st premolar	0.92	0.38	0.99	0.35	0.139	0.94	0.36	0.97	0.38	0.322	0.99	0.39	0.94	0.36	0.239
2nd premolar	1.40	0.46	1.49	0.55	0.162	1.40	0.50	1.50	0.52	0.133	1.46	0.63	1.44	0.45	0.419
1st molar	2.04	0.57	2.18	0.61	0.093	2.04	0.59	2.20	0.59	0.062	2.20	0.68	2.09	0.55	0.165
2nd molar	2.49	0.61	2.58	0.60	0.201	2.64	0.56	2.47	0.66	0.058	2.56	0.65	2.55	0.61	0.337

* Student’s t-test for independent groups; ** Student’s t-test for relates groups; $\overline{\text{x}}$, mean; SD, standard deviation.