Table 4.

Multiple logistic regression analysis about knowledge of the link between HPV infection and OPC (Model 1) and high perceived risk of developing OPC (Model 2) according to several explanatory variables.

Variable	OR		95% CI	p
°Model 1. Knowledge that OPC is an HPV infection related disease.
Log likelihood = −198.19, χ2 = 19.28 (4 df), p = 0.0007, No. of obs = 323
Age group, years (ordinal) (1 = ≤29;2 = 30–39;3 = 40–49;4 = ≥50)	0.75		0.60–0.94	0.012
Frequency of seeking dental care
Never/rarely	1.00*
Sometimes/often	1.82		1.13–2.93	0.015
Personal, family or friends’ history of cancer
No	1.00*
Yes	1.97		1.05–3.69	0.034
Smokers
Never	1.00*
Past/current	0.62		0.39–1.00	0.052
aModel 2. High perceived risk of developing OPC.
Log likelihood = −141.19, χ2 = 24.52 (6 df), p = 0.0004 No. of obs =270
Sexually transmitted diseases (STD) diagnosis (es)
No	1.00*
Yes	2.36		1.14–4.91	0.021
Early sexual debut is a risk factor for OPC
No/do not know	1.00*
Yes	2.29		1.07–4.90	0.033
Frequency of seeking dental care
Never/rarely	1.00*
Sometimes/often	0.43		0.24–0.77	0.005
Marital status
Unmarried/widowed/separated/divorced	1.00*
Married/cohabitant	0.74		0.41–1.34	0.322
Smokers
Never	1.00*
Past/current	1.42		0.79–2.55	0.245
Perception of the usefulness of dentists in the provision of information about OPC
Not at all useful/not very useful	1.00*
Useful/very useful	1.69		0.91–3.14	0.094

*Reference category.

°The following variables were deleted by the backward elimination procedure: marital status, occupation, alcohol consumption, STD diagnosis(es), perception of the usefulness of dentists in the provision of information about HPV infection, perception of the usefulness of dentists in the provision of information about OPC.

^aThe following variables were deleted by the backward elimination procedure: age group, years (ordinal), occupation, perception of the usefulness of dentists in the provision of information about HPV infection.