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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