Table 9 Duration of smoking and OPMD or OC.

From: Prevalence and risk factors of oral potentially malignant disorders in Indonesia: a cross-sectional study undertaken in 5 provinces

Level A

Level B

Odds ratio

95% CI

P-values

5–15 years

 < 5 years

1.1

(0.41, 3.02)

NS

 > 15 years

 < 5 years

1.1

(0.42, 2.66)

NS

Non-smokers

 < 5 years

0.2

(0.1, 0.47)

 < 0.05

 > 15 years

5–15 years

1

(0.42, 2.15)

NS

Non-smokers

5–15 years

0.2

(0.09, 0.38)

 < 0.05

Non-smokers

 > 15 years

0.2

(0.12, 0.34)

 < 0.05

  1. Odds ratio for level A relative to level B.
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