Table 2.

Weighted Item Nonresponse Rates on Sexual Orientation, Income, and Education by Age: Washington State Behavioral Risk Factor Surveillance System (BRFSS-WA), 2003–2010.

		Sexual orientation
	Total		Don’t know/not sure	Refuse to answer	Income	Education	Race/ethnicity
Age	Weighted % [95% CI]	AORa	Weighted % [95% CI]	Weighted % [95% CI]	Weighted % [95% CI]	Weighted % [95% CI]	Weighted % [95% CI]
Total	1.93 [1.84, 2.03]	—	0.75 [0.69, 0.82]	1.18 [1.11, 1.25]	12.16 [11.91, 12.42]	0.16 [0.14, 0.19]	1.16 [1.08, 1.25]
18–49	1.57 [1.44, 1.72]	0.31***	0.66 [0.57, 0.76]	0.92 [0.82, 1.02]	11.77 [11.40, 12.16]	0.14 [0.11, 0.19]	1.25 [1.13, 1.38]
50–64	1.50 [1.37, 1.65]	0.43***	0.41 [0.34, 0.50]	1.09 [0.98, 1.21]	9.69 [9.37, 10.03]	0.13 [0.10, 0.18]	1.10 [0.99, 1.23]
65 and  older	4.04 [3.81, 4.27]	(ref)	1.68 [1.54, 1.84]	2.35 [2.18, 2.54]	17.68 [17.24, 18.14]	0.28 [0.22, 0.35]	0.91 [0.81, 1.03]

Note. CI = confidence interval; AOR = adjusted odds ratio; nonresponse rates on income, education, and race/ethnicity included both the rates of “don’t know/not sure” and rates of “refuse to answer;” 95% CIs of weighted estimates were computed to compare item nonresponse rates by age-groups.

^aAn adjusted logistic regression was applied to examine to compare the odds of item nonresponse on sexual orientation by age-groups with coding age 65 and older as the reference group and after controlling for gender, income, education, and race/ethnicity.

^***p < .001.