Table 2.

Estimated odds ratios with 95% confidence intervals for interactions

	Predictor	Odds Ratio
Sex, Respondent Type (Reference Group: Female and Male, Self)
	Male, Proxy	1.23* (1.20, 1.27)
Age, Respondent Type (Reference Group: Self and 65+, Proxy)
	18-24, Proxy	0.71* (0.66, 0.75)
	25-44, Proxy	0.97 (0.92, 1.02)
	45-64, Proxy	0.98 (0.93, 1.03)
Education, Respondent Type (Reference Group: Self and 16+, Proxy)
	< 12 years, Proxy	0.97 (0.92, 1.03)
	12 years, Proxy	1.07* (1.02, 1.12)
	13-15 years, Proxy	0.92* (0.88, 0.96)
Survey Year, Survey Mode (Reference Group: In-Person and 2003, Telephone)
	1992-93, Telephone	0.90* (0.86, 0.94)
	1995-96, Telephone	0.95 (0.91, 1.00)
	1998-99, Telephone	0.92* (0.88, 0.96)
	2001-02, Telephone	0.96 (0.91, 1.00)
Sex, Survey Mode (Reference Group: Female and Male, In-Person)
	Male, Telephone	0.92* (0.90, 0.94)
Age, Survey Mode (Reference Group: In-Person and 65+, Telephone)
	18-24, Telephone	0.86* (0.81, 0.91)
	25-44, Telephone	0.90* (0.86. 0.93)
	45-64, Telephone	0.92* (0.87, 0.96)

Note: Results are based on logistic regression. Reference groups for interactions are determined based on the reference groups for the main effects presented in Table 2;

^*Indicates a statistically significant result when compared to the reference group at 5% significance level.