Table 2.

Demographics and smoking among CBS vs. RDDTS Black samples by telephone status.

	Group 1 CBS P/CPO (N = 230)	Group 2 CBS landline (N = 1522)	Group 3 RDDTS Blacks (N = 2315)	Significance test	p
Age
Mean (SD)	37.7 (13.9)	45.3 (16.3)	52.3 (17.0)	F2,3941 = 132.07	<0.001
				tGroups 1,2 = 7.15	<0.001
				tGroups 1,3 = 14.31	<0.001
				tGroups 2,3 = 12.57	<0.001
Age groups				${\mathrm{\chi }}_{\text{df = 4}}^2=175.50$	<0.001
18–25 years	24.5%	14.1%	7.8%	zGroups 1,2 = 3.81	<0.001
				zGroups 1,3 = 7.96	<0.001
				zGroups 2,3 = 6.15	<0.001
26–39 years	32.5%	23.8%	15.2%	zGroups 1,2 = 2.67	0.008
				zGroups 1,3 = 6.39	<0.001
				zGroups 2,3 = 6.51	<0.001
40 years and older	42.9%	62.1%	77.0%	zGroups 1,2 = 5.23	<0.001
				zGroups 1,3 = 10.77	<0.001
				zGroups 2,3 = 9.75	<0.001
Gender				${\mathrm{\chi }}_{\text{df = 2}}^2=44.03$	<0.001
Men	56.0%	40.6%	34.8%	zGroups 1,2 = 4.21	<0.001
				zGroups 1,3 = 6.13	<0.001
				zGroups 2,3 = 3.15	<0.001
Women	44.0%	59.4%	65.2%	zGroups 1,2 = 4.21	<0.001
				zGroups 1,3 = 6.13	<0.001
				zGroups 2,3 = 3.55	<0.001
Income				${\mathrm{\chi }}_{\text{df = 6}}^2=153.60$	<0.001
Less than $10,999	45.2%	17.1%	13.2%	zGroups 1,2 = 9.18	<0.001
				zGroups 1,3 = 11.99	<0.001
				zGroups 2,3 = 3.17	0.002
$11,000–25,999	16.8%	18.8%	21.5%	zGroups 1,2 = 0.57	0.57
				zGroups 1,3 = 1.48	0.14
				zGroups 2,3 = 1.93	0.05
$26,000–49,999	18.3%	24.8%	23.0%	zGroups 1,2 = 1.98	0.05
				zGroups 1,3 = 1.48	0.14
				zGroups 2,3 = 1.20	0.23
$50,000 and higher	19.7%	39.3%	42.3%	zGroups 1,2 = 5.34	<0.001
				zGroups 1,3 = 6.28	<0.001
				zGroups 2,3 = 1.75	0.08
Education				${\mathrm{\chi }}_{\text{df\hspace{0.17em}=\hspace{0.17em}4}}^2=41.88$	<0.001
Less than high school	11.1%	6.1%	9.2%	zGroups 1,2 = 2.60	0.009
				zGroups 1,3 = 0.80	<0.001
				zGroups 2,3 = 3.31	<0.001
HS Grad or GED	40.7%	26.2%	25.6%	zGroups 1,2 = 4.46	<0.001
				zGroups 1,3 = 4.78	<0.001
				zGroups 2,3 = 0.31	0.76
College and higher	48.2%	67.7%	65.1%	zGroups 1,2 = 5.65	<0.001
				zGroups 1,3 = 4.97	<0.001
				zGroups 2,3 = 1.57	0.12
Current smoking
Overall%	50.2%	29.5%	19.1%	${\mathrm{\chi }}_{\text{df\hspace{0.17em}=\hspace{0.17em}2}}^2=129.70$	<0.001
				zGroups 1,2 = 5.89	<0.001
				zGroups 1,3 = 10.38	<0.001
				zGroups 2,3 = 7.25	<0.001
Current smoking
Men	47.7%	32.9%	21.1%	zGroups 1,2 = 2.42	0.02
				zGroups 1,3 = 5.90	<0.001
				zGroups 2,3 = 5.54	<0.001
Women	53.4%	25.3%	18.0%	zGroups 1,2 = 5.18	<0.001
				zGroups 1,3 = 7.94	<0.001
				zGroups 2,3 = 4.62	<0.001