Table 1

Sample characteristics of the Tobacco Promotion Impact Study (TPIS)

2010 (n=2000)2011 (n=2010)2012 (n=2003)2013 dual-frame (n=2807)2013 landline (n=2001)
NPer centNPer centNPer centNPer centp ValueNPer centp Value
Age in years0.9500.974
 12–156693264932619328333168431
 16–1982631833308553010463179931
 20–245053752838529389283951839
Sex1.001.00
 Female97549990499924913254998049
 Male102551102151101151148251102151
State1.001.00
 NSW100050100450100050140750100150
 QLD100050100050100050140050100050
SES0.0150.011
 Low5572849725578297352853626
 Mod–high144372151475142571205672146574
Smoking status<0.001<0.001
 Never117856127861127661176960137664
 Experimenter4762544824471255992238221
 Former534423362703363
 Current2931624313220123691620712
Smoking susceptibility*0.0740.075
 Non-susceptible941819997996876138379107179
 Susceptible2371927921308243862130521
Cigarettes per day†
 <2136431124410444183470.781106480.767
 ≥21775714456131562075311652
Friends smoke M (SD)1.27 (1.60)1.10 (1.51)1.05 (1.47)1.11 (1.52)<0.0010.93 (1.41)<0.001
House smoke M (SD)0.52 (0.86)0.47 (0.86)0.49 (1.01)0.51 (0.99)<0.0010.42 (0.82)0.048
  • Ns unweighted, %s are weighted; p values from χ2 tests for differences between proportions or ANOVA tests for differences between means.

  • *Never smokers.

  • †Smokers.

  • M, Mean; NSW, New South Wales; QLD, Queensland; SES, Socioeconomic Status (based on postal code).