Table 1.

Test-Retest Reliability of Respondents’ Demographic and Tobacco Use Data (N = 333)

	Time 1	Time 2	ICC or kappa	95% CI or SE
Demographics
Age, years, mean (SD) range 18–64	45.95 (11.74)	45.98 (11.73)	1	—
Sex: male, %	59	59	1	—
Race: non-Hispanic white, %	67.1	67.1	1	—
Tobacco use
Do you now smoke, every day %	74.1	80.5	0.594	0.05
Considering quitting in next 30 days (daily smokers)	24.4	19.5	0.551	0.045
How many times have you quit for 24 hours in past year among daily smokers, mean (SD)	1.43 (2.40)	1.84 (3.50)	0.638	0.557–0.707

CI = confidence interval; ICC = intra-class correlation coefficient; SE = standard error.