Lifestyles and preventive practices. Absolute figures 
Frequency of mammograms, by social class of the main breadwinner. Women aged 20 years old and over who have had a mammogram at some point in time
Units: thousands of persons

	Total	At least once a year	Every two years	Every three years or more	Never	No data recorded	
Total	9,306.8	2,470.8	3,783.3	801.3	2,005.9	245.5	
I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees	976.1	335.9	371.4	73.7	170.5	24.6	
II: Executives of companies with fewer than 10 employees, and professions associated  with intermediate degrees. Advanced technicians. Artists and sportspersons	934.5	249.1	356.7	97.7	207.4	23.5	
III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers	2,294.9	651.4	919.6	189.1	482.1	52.7	
IVa: Skilled manual workers	2,421.8	609.2	1,021.3	198.0	535.4	57.9	
IVb: Semi-skilled manual workers	1,176.2	271.3	486.8	114.3	282.9	20.8	
V: Unskilled workers	1,230.7	284.7	529.2	97.4	295.6	23.8	
No data recorded	272.7	69.2	98.3	31.0	32.1	42.2	
Notes:
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