Table 7.

Multivariate logistic regression analysis to identify independent risk factors affecting high PISA value in HNC patients

Risk factor	Odds ratio	95% CI	P value
Age	0.64	0.05–7.63	0.73
Smoking status
Former	1.03	0.31–3.40	0.96
Current	7.51	1.63–34.71	< 0.01*
Diabetes mellitus	1.08	0.28–4.12	0.90
Presence of untreated dental caries	3.33	1.23–9.00	< 0.05*

Analysis based on five factors showing a P value < 0.05 was performed using a univariate Mann–Whitney U test, a chi-squared test, or univariate logistic regression, and one factor considered to be clinically relevant

^*P < 0.05 (statistically significant in multivariate logistic regression via forced-entry method)