Table 3.

The frequency of the right and left primary rugae.

Number of primary rugae	Right (N = 343)		Left (N = 343)		Total	P value
	Number	%	Number	%	Mean %
1	3	0.9	2	0.6	0.8
2	30	8.7	41	11.8	10.3
3	150	43.7	148	43.2	43.5
4	120	35.0	129	37.6	36.1	0.083
5	35	10.2	23	6.8	8.5
6	5	1.5	0	0	0.8
Total	343	100	343	100	100