Daily exposure to tobacco smoke indoors by sex, age and educational attainment level
                methods, notes and classification
            
         
     
 
    
        
            
                
                
                
                
                    
                    
                        
                            -  Unit of measure
 -  Frequency
- 0 At least 1 hour every day
 - 1 Less than 1 hour every day
 - 2 Less than once a week
 - 3 At least once a week
 - 4 Rarely or never
 
 -  International Standard Classification of Education (ISCED 2011)
- 0 All ISCED 2011 levels
 - 1 Less than primary, primary and lower secondary education (levels 0-2)
 - 2 Upper secondary and post-secondary non-tertiary education (levels 3 and 4)
 - 3 Tertiary education (levels 5-8)
 
 -  Sex
 -  Age class
- 0 Total
 - 1 From 15 to 19 years
 - 2 From 15 to 24 years
 - 3 From 15 to 29 years
 - 4 From 15 to 44 years
 - 5 From 15 to 64 years
 - 6 From 18 to 24 years
 - 7 From 18 to 44 years
 - 8 From 18 to 64 years
 - 9 18 years or over
 - a From 20 to 24 years
 - b From 25 to 29 years
 - c From 25 to 34 years
 - d From 25 to 64 years
 - e From 35 to 44 years
 - f From 45 to 54 years
 - g From 45 to 64 years
 - h From 55 to 64 years
 - i From 65 to 74 years
 - j 65 years or over
 - k 75 years or over
 
 -  Geopolitical entity (reporting)
- 0 European Union - 27 countries (from 2020)
 - 1 European Union - 28 countries (2013-2020)
 - 2 Belgium
 - 3 Bulgaria
 - 4 Czechia
 - 5 Denmark
 - 6 Germany (until 1990 former territory of the FRG)
 - 7 Estonia
 - 8 Ireland
 - 9 Greece
 - a Spain
 - b France
 - c Croatia
 - d Italy
 - e Cyprus
 - f Latvia
 - g Lithuania
 - h Luxembourg
 - i Hungary
 - j Malta
 - k Netherlands
 - l Austria
 - m Poland
 - n Portugal
 - o Romania
 - p Slovenia
 - q Slovakia
 - r Finland
 - s Sweden
 - t Iceland
 - u Norway
 - v United Kingdom
 - w Serbia
 - x Turkey