Table 2. Predictors of practitioner behavior in relation to asking about patient smoking status.

	Univariate model	Multivariate model
Variable	p value	p value	Adjusted OR (95% CI)
Own smoking status	0.383
Taken dietary supplements in past year	0.017*	0.090
Own annual expenditure on dietary supplements	0.282
Gender	0.171
Age	0.034*	0.016*	1.30 (1.05 to 1.61)
Therapeutic endorsement status	0.230
Years in practice	0.116
Practice location	0.632

* indicates a statistically significant difference (p < 0.05).

Only those variables found to be statistically significant by multiple univariate modeling were included in the subsequent multivariate modeling. Smoking status was collapsed to become dichotomous, i.e., ever or never.