Table 1. Clinical diagnosis and risk factors.

Clinical diagnosis	Risk factors
	Smoking		Drinking		Exposure to sunlight
	No	Yes	No	Yes	No	Yes
	n (%)	n (%)	n (%)	n (%)	n (%)	n (%)
Actinic cheilitis	38 (64.4)	15 (30)	37 (50.7)	16 (44.4)	24 (32.4)	29 (82.9)
Oral lichen planus	5 (8.5)	1 (2)	2 (2.7)	4 (11.1)	6 (8.1)	0 (0)
Oral leukoplakia	8 (136)	19 (38)	20 (27.4)	7 (19.4)	24 (32.4)	3 (8.6)
Oral erythroplakia	2 (3.4)	4 (8)	3 (4.1)	3 (8.3)	5 (6.8)	1 (2.9)
Erythroleukoplakia	3 (5.1)	8 (16)	6 (8.2)	5 (13.9)	9 (12.2)	2 (5.7)
Atypical ulcerated lesion	1 (1.7)	3 (6)	3 (4.1)	1 (2.8)	4 (5.4)	0 (0)
Malignant mesenchymal lesion	1 (1.7)	0 (0)	1 (1.4)	0 (0)	1 (1.4)	0 (0)
Malignant vascular lesion	1 (1.7)	0 (0)	1 (1.4)	0 (0)	1 (1.4)	0 (0)