Bias of health estimates obtained from chronic disease and risk factor surveillance systems using telephone population surveys in Australia: results from a representative face-to-face survey in Australia from 2010 to 2013

Eleonora Dal Grande; Catherine R. Chittleborough; Stefano Campostrini; Anne W. Taylor

doi:10.1186/s12874-016-0145-z

Table 2 Prevalence of health conditions and risk factors for all households, and for landline Random Digit Dialling (RDD) and Directory-listed (EWP) telephone samples, 15 years and over

From: Bias of health estimates obtained from chronic disease and risk factor surveillance systems using telephone population surveys in Australia: results from a representative face-to-face survey in Australia from 2010 to 2013

			2010			2011			2012			2013
		n	% (95 % CI)	RCB	n	% (95 % CI)	RCB	n	% (95 % CI)	RCB	n	% (95 % CI)	RCB
	Health conditions
Diabetes	All households	229	7.5 (6.6–8.5)		246	8.1 (7.1–9.2)					247	8.5 (7.6–9.5)
	Landline (RDD) sample	181	7.2 (6.2–8.3)	–0.009	195	8.3 (7.1–9.6)	0.003				173	8.3 (7.4–9.4)	−0.033
	Directory-listed sample	133	7.1 (6.0–8.5)	−0.021	148	8.6 (7.1–10.3)	0.030				117	7.9 (6.7–9.4)	−0.077
Current asthma	All households	416	13.6 (12.2–15.3)		384	12.7 (11.4–14.0)
Current asthma	Landline (RDD) sample	335	13.3 (11.7–15.2)	−0.015	297	12.6 (11.1–14.2)	−0.002
	Directory-listed sample	246	13.1 (11.3–15.2)	−0.061	220	12.8 (10.9–15.0)	−0.014
Arthritis	All households	653	21.4 (19.9–23.1)		727	24.0 (22.3–25.7)		656	21.5 (19.7–23.3)		640	22.0 (20.3–23.8)
	Landline (RDD) sample	529	21.1 (19.5–22.8)	−0.025	554	23.5 (21.6–25.4)	−0.031	495	21.2 (19.3–23.2)	0.009	464	22.3 (20.4–24.4)	0.019
	Directory-listed sample	387	20.7 (18.9–22.6)	−0.083	407	23.7 (21.4–26.1)	−0.018	346	20.7 (18.5–23.2)	−0.046	324	22.0 (19.7–24.4)	−0.016
Mental health condition	All households	330	10.8 (9.6–12.2)		359	11.8 (10.7–13.1)		297	9.7 (8.7–10.8)		384	13.2 (11.8–14.7)
Mental health condition	Landline (RDD) sample	250	10.0 (8.6–11.5)	−0.100	275	11.6 (10.3–13.1)	−0.046	222	9.5 (8.2–10.9)	−0.025	256	12.3 (10.7–14.1)	−0.091
	Directory-listed sample	167	8.9 (7.4–10.7)	−0.242	221	12.9 (11.0–15.0)	0.056	150	9.0 (7.6–10.6)	−0.102	172	11.6 (9.4–14.3)	−0.141
	Health - related risk factors
Current smoker	All households	614	20.2 (18.3–22.1)		529	17.4 (15.8–19.2)		501	16.4 (14.8–18.2)		552	19.0 (16.6–21.6)
Current smoker	Landline (RDD) sample	429	17.1 (15.2–19.2)	−0.136	343	14.5 (12.8–16.5)	−0.191	304	13.0 (11.4–14.9)	−0.174	330	15.9 (13.6–18.6)	−0.138
	Directory-listed sample	316	16.9 (14.7–19.3)	−0.129	223	13.0 (10.9–15.4)	−0.313	210	12.6 (10.8–14.7)	−0.181	202	13.7 (11.6–16.1)	−0.244
Obese	All households	611	22.1 (20.4–24.0)		612	22.7 (20.9–24.6)		621	23.4 (21.5–25.4)		603	23.1 (20.7–25.8)
	Landline (RDD) sample	511	22.6 (20.7–24.6)	0.036	491	23.3 (21.2–25.5)	0.013	474	23.5 (21.4–25.8)	−0.020	454	24.3 (21.8–27.0)	0.078
	Directory-listed sample	379	22.5 (20.3–25.0)	−0.002	359	23.8 (21.2–26.6)	0.059	329	22.7 (20.1–25.5)	−0.050	329	24.6 (21.6–27.9)	0.079

Note: RCB relative coverage bias, Landline (RDD) sample households that had a landline connection (mobile-only households excluded); Directory-listed sample households with either a landline or mobile telephone number listed in the White Pages

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