Encuesta de Fecundidad Knowledge and use of contraceptions. Fem. between 15-49 Females between 15 and 49 years, have not used or use contraceptions by levelof studies and number of live births. Unidades: relative figures ,Total,None,One,Two,Three,Four,Five and more, Total,100,84,24,4,56,7,56,2,68,0,49,0,47, Illiterate,100,49,69,..,..,10,19,9,18,30,94, Without studies,100,29,25,9,61,22,53,20,53,10,47,7,6, Primary education and second grade, GBE or first year of GCSE,100,77,49,6,58,11,41,3,82,0,51,0,18, Secondary Education and Post-secondary non-higher,100,94,62,2,04,2,48,0,61,0,14,0,11, 1º, 2º and intermediate technical-professional studies,100,90,49,3,32,3,58,2,19,0,1,0,32, Higher level technical-professional studies,100,97,04,2,96,..,..,..,.., First year of tertiary education,100,89,74,4,39,4,69,1,18,..,.., Tertiary education, university graduates and doctors,100,90,4,1,39,6,77,..,..,1,44, Notas: Fuente: National Statistics Institute