Therefore, for the purpose of our study, we treated them as middle income countries. We used individual level data from the first round of GATS in each of the 15 LMICs. GATS respondents in each country who reported working indoors (or both indoors and outdoors) but outside their home were included as participants for this study. Observations with missing values in the dependent or independent variables were dropped to SB431542 in vitro obtain a final sample for each country. The proportion of missing cases ranged from 0.1% in Uruguay to 8.5% in China (Table 1). Table 1 describes the total number of participants included in our study from each of the 15 LMICs which ranged from 1174

in Romania to 12,912 in Brazil. The GATS questionnaire includes core questions on tobacco use, SHS exposure at work and in the home, and socio-demographic information. For the present study, the dependent variable was ‘living in a smoke-free home’. A participant was classified as living Doxorubicin in a smoke-free home if he/she replied ‘never’ to the question: How often does anyone smoke inside your home? If the participant responded ‘daily’,

‘weekly’, ‘monthly’, or ‘less than monthly’, he/she was considered as not living in a smoke-free home. The independent variable was ‘being employed in a smoke-free workplace’. The participant was classified as employed in a smoke-free workplace if he/she answered ‘no’ to the question: During the past 30 days, did anyone smoke in the indoor areas where you work? The potential confounders included were: age group, gender, residence, education, occupation,

current smoking, current smokeless tobacco (SLT) use and number of household members. A country-specific very region variable was also included for India, Thailand, China, Brazil, Poland and Ukraine (this information was not available for other countries). Current SLT use was not included as a covariate for Uruguay, Romania and Turkey as there were only a very small number of users or no data on SLT use was available. In China, the occupation variable consisted of five categories rather than two as the categorization for employment differed substantially from other countries (Centers for Disease Control and Prevention, 2013b). Due to a negligible number of participants educated up to primary level in Romania, Russian Federation and Ukraine, we merged these with the ‘up to secondary level’ education category. See Supplementary Table for a detailed description of the definitions of variables used in this study. We conducted country-specific, individual level data analysis for each LMIC. We tested for bivariate associations between the independent variable with the dependent variable using Chi-square tests.