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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)        
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)  
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)  
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
  1. 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