Int. J. Environ. Res. Public Health 2011, 8 417 (53.4%) and Canada (60.9%) had the lowest proportions in Waves 5 and 6, respectively. Following stratification by SES, the proportion of current smokers with a total ban increased with increasing SES at both Waves, regardless of country of residence. A similar trend was observed across SES levels among former smokers in Canada, while a significant lack of trend was observed in Australia. With the exception of the US and Australia, both the introduction and retention of a total ban in the home among continuing smokers also increased with increasing SES. Table 2 presents the findings of a binary logistic regression analysis to identify predictors of the presence, introduction, and removal of a total ban on smoking in the home. Among current and continuing smokers from all four countries combined, those with either ‘moderate’ [Odds Ratio (OR): 1.31, 95% Confidence Interval (CI): 1.10–1.55] or ‘high’ [OR: 1.54, 95% CI: 1.27–2.87] SES had an increased odds of having a total ban in Wave 5, as well as a decreased odds of removal of a ban by Wave 6 [‘Moderate’ OR: 0.52, 95% CI: 0.34–0.80; ‘High’ OR: 0.44, 95% CI: 0.26–0.73]. Additional predictors of increased odds of a policy in Wave 5 were male gender, the presence of children in the home, the presence of an adult non-smoker in the home, greater support for smoking bans in public venues, and residence in the US or Australia. Predictors of increased odds of removal of a total ban were higher Heaviness of Smoking Index (HSI) and residence in the UK, while predictors of decreased odds included greater support for smoking bans in public venues, presence of an adult non-smoker in the home, and residence in Australia. Among continuing smokers with no total ban in Wave 5, those with ‘high’ SES had an increased odds of adopting a total ban by Wave 6 [OR: 1.49, 95% CI: 1.04–2.13]. Additional predictors of increased odds of total ban introduction were greater support for smoking bans in public venues, the presence of a non-smoking adult in the home, and residence in the UK or Australia, while predictors of decreased odds were older age and higher HSI. There was no significant interaction observed between SES and country in any of the regression models, and thus the findings are not presented here.