Table 4. Prevalence and unadjusted risk of Oral Potentially Malignant Disorders by major lifestyles.

	Pop.	Oral Potentially Malignant Disorders
		Number	Percent [95% CI]	Crude Odds Ratio
Betel quid chewing habit
Non-chewers (Ref. group)	258	1	0.4 [0 to 2.1]	1
Chewers without tobacco	44	1	2.3 [0.06 to 12]	6 [2 to 17]
Chewers with tobacco	240	23	9.6 [6.2 to 14]	27 [12 to 62]
Smoking habit
Non-smoker (Ref. group)	371	17	4.6 [2.7 to 7.2]	1
Smoker	171	8	4.7 [2.0 to 9.0]	1.02 [0.4 to 2.6]
Alcohol drinking habit
Non-drinker (Ref. group)	451	17	3.8 [2.2 to 6.0]	1
Drinker	91	8	8.8 [3.9 to 16.6]	2.5 [1.1 to 5.7]

CI = Confidence interval