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Table 3 Effect of second hand smoking campaigns (2004–2010) on odds of smoke-free home, n = 9,872

From: The effectiveness of tobacco control television advertisements in increasing the prevalence of smoke-free homes

Covariate Categories OR (95 % CI) p
Timea   1.01 (1.01–1.02) 0.005
Tobacco control campaigns Second hand smoke GRPsa 0.99 (0.93–1.05) 0.740
Second hand smoke GRPs (1 month)a 1.07 (1.01–1.13) 0.033
Second hand smoke GRPs (2 months)a 0.98 (0.92–1.04) 0.490
Other GRPsa 1.02 (0.99–1.04) 0.134
Other GRPs (1 month)a 1.00 (0.98–1.02) 0.755
Other GRPs (2 months)a 1.01 (0.98–1.03) 0.561
TCS Score 24.5 1  
27 1.13 (0.88–1.46) 0.334
  48 1.53 (1.02–2.31) 0.041
  51 1.25 (0.81–1.94) 0.320
Season Summer 1  
Autumn 0.97 (0.84–1.13) 0.695
Spring 0.86 (0.73–1.02) 0.098
Winter 0.84 (0.71–0.99) 0.041
Government office region North East 1  
North West 0.67 (0.52–0.87) 0.003
Yorkshire and the Humber 0.78 (0.59–1.02) 0.069
East Midland 0.71 (0.54–0.93) 0.014
West Midland 0.85 (0.65–1.12) 0.246
East of England 0.91 (0.70–1.20) 0.514
London 0.71 (0.54–0.92) 0.010
South East 0.73 (0.56–0.94) 0.017
South West 1.08 (0.82–1.43) 0.567
Gender of smokers in household All female smokers 1  
All male smokers 1.44 (1.29–1.60) <0.001
Mixed smokers 1.18 (0.87–1.60) 0.280
Average age of smokers in household 18–24 1  
25–39 0.73 (0.62–0.87) <0.001
40–54 0.51 (0.43–0.62) <0.001
55+ 0.32 (0.26–0.38) <0.001
NS-SEC of head of household Managerial & professional 1  
Intermediate 0.79 (0.69–0.91) 0.001
Routine & manual 0.64 (0.57–0.72) <0.001
Other 0.58 (0.43–0.77) <0.001
Average level of dependence of smokers in household 0 (least addicted) 12.51 (6.67–23.45) <0.001
1 5.00 (2.65–9.42) <0.001
2 3.43 (1.83–6.46) <0.001
3 2.25 (1.19–4.23) 0.012
4 1.24 (0.65–2.35) 0.512
5 0.42 (0.19–0.93) 0.033
6 (most addicted) 1  
Age of youngest child in household No child 1  
0-5 2.60 (2.24–3.01) <0.001
6-15 1.34 (1.17–1.53) <0.001
Number of adult smokers Two or more smokers 1  
Lone smoker 2.82 (2.12–3.77) <0.001
Lone smoker (lives alone) 0.83 (0.63–1.11) 0.217
Index of Multiple deprivation 1 (least deprived) 1  
2 1.02 (0.86–1.21) 0.839
3 0.79 (0.66–0.93) 0.006
4 0.60 (0.50–0.71) <0.001
5 (most deprived) 0.41 (0.34–0.50) <0.001
  1. aTime and GRPs at different lags were initially considered as nonlinear smooth terms and as they were found to be linear (spline effective degrees of freedom = 1), replaced with linear terms. The table presents the ORs for having a smoke-free home associated with a 100 point increase in GRPs. Also included in the model is a covariate for number of addresses in each PSU. Likelihood ratio test p values are not shown for categorical variables as modelling was based on quasi-likelihood