Lifestyles and preventive practices. Absolute figures 
Average age at beginning to use tobacco of daily smokers, by sex and social class of the main breadwinner. Average and standard deviation. Population aged 16 years old and over that smokes daily
Units: average and standard deviation

	Average	Standard deviation	
BOTH SEXES	
    Total	17.35	4.55	
    I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees	18.16	5.26	
    II: Executives of companies with fewer than 10 employees, and professions associated  with intermediate degrees. Advanced technicians. Artists and sportspersons	17.19	3.67	
    III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers	17.39	4.37	
    IVa: Skilled manual workers	17.25	4.62	
    IVb: Semi-skilled manual workers	17.06	3.99	
    V: Unskilled workers	17.34	5.25	
    No data recorded	18.44	4.82	
MALES	
    Total	17.04	4.14	
    I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees	18.04	4.99	
    II: Executives of companies with fewer than 10 employees, and professions associated  with intermediate degrees. Advanced technicians. Artists and sportspersons	17.22	3.64	
    III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers	17.19	4.24	
    IVa: Skilled manual workers	16.82	3.77	
    IVb: Semi-skilled manual workers	16.81	3.74	
    V: Unskilled workers	16.78	4.75	
    No data recorded	18.39	4.14	
FEMALES	
    Total	17.78	5.05	
    I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees	18.29	5.56	
    II: Executives of companies with fewer than 10 employees, and professions associated  with intermediate degrees. Advanced technicians. Artists and sportspersons	17.15	3.71	
    III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers	17.69	4.52	
    IVa: Skilled manual workers	17.89	5.60	
    IVb: Semi-skilled manual workers	17.36	4.27	
    V: Unskilled workers	18.28	5.87	
    No data recorded	18.48	5.31	
Notes:
1) Population aged 16 years old and over that smokes daily
The symbol '.' shall be deemed as data which cannot be provided since it may be affected by sampling errors.
 The symbol '..' shall be deemed as data which is not collected.
 The symbol '...' shall be deemed as an 'error of division by zero'.
Source: Ministry of Health and Consumption and INE