Factor Rate ratio
(95% CI)a
Gender
Male 1
Female 0.8 (0.67; 0.97)
Education
University/postgraduate 1
Technical college 0.81 (0.62; 1.05)
Secondary school 0.95 (0.75; 1.2)
Primary school 1.83 (1.08; 3.1)
Smoking
Never smoker 1
Used to smoke 0.91 (0.73; 1.13)
Current smoker 0.6 (0.45; 0.8)
Alcohol consumption
Does not drink 1
Less than once a week 0.83 (0.64; 1.06)
Once or twice a week 0.7 (0.54; 0.91)
Every day 0.69 (0.48; 1)
Number of teeth
20 or more 1
10 - 19 1.49 (1.13; 1.97)
< 10 1.78 (1.25; 2.55)
No natural teeth 1.69 (1.21; 2.35)

aRate ratio of being UNAWARE of mouth cancer estimated from Cox regression model adjusted for age. All variables are in the same model. For example, participants with no natural teeth were 1.69 times more likely to be UNAWARE of mouth cancer compared to those who have 20 or more natural teeth.
CI = confidence interval.