Table 1.

Sample characteristics.

Variable			Total
			N	%
Age (mean; years)			44.3; SD = 14.11
Gender		Male	103	41.2
		Female	147	58.8
Medical history		Medically free	217	86.8
		Diabetes mellitus	12	4.8
		Hypertension	6	2.4
		High cholesterol level	6	2.4
		Diabetes and hypertension	5	2.0
		Chronic heart disease	2	0.8
		Bronchial asthma	2	0.8
Right	Variation of the mandibular canal	No	250	100
	Variation of the mental foramen	No	250	100
	History of mandibular teeth extraction	Yes	217	86.8
		No	33	13.2
	Number of extracted teeth (Median; number)		3
Left	Variation of the mandibular canal	No	250	100
	Variation of the mental foramen	No	250	100
	History of mandibular teeth extraction	Yes	221	88.4
		No	29	11.6
	Number of extracted teeth (Median; number)		3