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Table 4 Null and adjusted Prevalence Ratios (PR) for selected indicators using Poisson regression analysis with robust variance estimation, 2012 NSWPHS

From: Inclusion of mobile telephone numbers into an ongoing population health survey in New South Wales, Australia, using an overlapping dual-frame design: impact on the time series

Indicator Category Null Adjusted by weighting variables^
PR 95%CI PR 95%CI
Five or more drinks of alcohol in a day Dual phone users (mobile frame) 1.48 1.29 1.69 * 0.94 0.78 1.13  
Landline-only phone user 0.86 0.70 1.06   1.25 1.02 1.54 *
Mobile-only phone user 2.51 2.14 2.93 * 1.29 1.04 1.59 *
REF – Dual phone users (landline frame) 1.00     1.00    
More than two drinks of alcohol in a day Dual phone users (mobile frame) 1.18 1.10 1.27 * 0.88 0.80 0.97 #
Landline-only phone user 0.71 0.63 0.80 # 0.89 0.79 0.99 #
Mobile-only phone user 1.63 1.49 1.79 * 1.07 0.95 1.20  
REF – Dual phone users (landline frame) 1.00     1.00    
Recommended fruit intake Dual phone users (mobile frame) 0.94 0.90 0.97 # 0.99 0.94 1.04  
Landline-only phone user 0.99 0.95 1.04   0.96 0.92 1.01  
Mobile-only phone user 0.87 0.81 0.92 # 0.93 0.86 1.01  
REF – Dual phone users (landline frame) 1.00     1.00    
Recommended vegetable intake Dual phone users (mobile frame) 0.68 0.60 0.77 # 0.87 0.74 1.02  
Landline-only phone user 0.86 0.74 0.99 # 0.82 0.71 0.96 #
Mobile-only phone user 0.47 0.37 0.60 # 0.65 0.50 0.85 #
REF – Dual phone users (landline frame) 1.00     1.00    
Current smoking Dual phone users (mobile frame) 1.19 1.08 1.32 * 0.85 0.74 0.98 #
Landline-only phone user 1.03 0.91 1.18   1.34 1.18 1.53 *
Mobile-only phone user 2.10 1.88 2.35 * 1.39 1.20 1.63 *
REF – Dual phone users (landline frame) 1.00     1.00    
Adequate physical activity Dual phone users (mobile frame) 1.10 1.05 1.14 * 0.96 0.91 1.02  
Landline-only phone user 0.77 0.72 0.82 # 0.84 0.78 0.89 #
Mobile-only phone user 1.26 1.19 1.32 * 1.04 0.97 1.12  
REF – Dual phone users (landline frame) 1.00     1.00    
Positive self-reported health status Dual phone users (mobile frame) 1.05 1.03 1.07 * 1.04 1.00 1.07  
Landline-only phone user 0.86 0.84 0.89 # 0.89 0.86 0.92 #
Mobile-only phone user 1.05 1.02 1.08 * 1.01 0.97 1.05  
REF – Dual phone users (landline frame) 1.00     1.00    
Current asthma Dual phone users (mobile frame) 0.72 0.63 0.82 # 0.77 0.65 0.91 #
Landline-only phone user 0.98 0.86 1.13   1.02 0.88 1.17  
Mobile-only phone user 0.78 0.64 0.94 # 0.82 0.66 1.04  
REF – Dual phone users (landline frame) 1.00     1.00    
Ever diagnosed with diabetes Dual phone users (mobile frame) 0.69 0.60 0.80 # 1.01 0.86 1.20  
Landline-only phone user 1.63 1.45 1.83 * 1.23 1.09 1.38 *
Mobile-only phone user 0.51 0.40 0.66 # 1.13 0.86 1.49  
REF – Dual phone users (landline frame) 1.00     1.00    
Overweight or obese Dual phone users (mobile frame) 0.88 0.84 0.91 # 0.99 0.94 1.04  
Landline-only phone user 1.02 0.98 1.07   0.97 0.93 1.02  
Mobile-only phone user 0.73 0.68 0.78 # 0.90 0.83 0.97 #
REF – Dual phone users (landline frame) 1.00     1.00    
  1. NOTE: *significantly (p < 0.05) higher than reference category; #significantly (p < 0.05) lower than reference category.
  2. NOTE: ^weighting variables; age group, sex, health administration area, household size and number of telephone lines.