Covariate

Definition

IRA

(1) The subject goes to a dentist regularly or occasionally whether or not has a problem, (0) The subject did go to a dental check-up once a year or more often in the previous 5 years.

Gender

(1) Female, (0) Male.

Cavit

(1) The subject reported having cavities (tooth decay) in the previous 6 months, (0) if not.

Loose

(l) The subject had a loose tooth, (0) had not

Able

(1) The subject able to pay unexpected US$ 500 dental bill, but with difficulty, (0) not able to pay