Encuesta de Fecundidad Characteristics marriages / couples and exposure to pregnancy risk. Women 15-49 years Females between 15 and 49 years level of studies marital status. Unidades: Relative figures ,Total,Single,Married,Widows,Separated or divorced, Total,100,43,82,51,62,0,88,3,68, Illiterate,100,38,74,48,46,0,68,12,12, Without studies,100,10,88,81,5,3,05,4,57, Primary education and second grade, GBE or first year of GCSE,100,32,8,62,08,1,26,3,86, Secondary Education and Post-secondary non-higher,100,64,19,32,12,0,21,3,49, 1º, 2º and intermediate technical-professional studies,100,49,29,46,61,0,66,3,44, Higher level technical-professional studies,100,74,25,25,75,..,.., First year of tertiary education,100,45,77,50,62,0,55,3,06, Tertiary education, university graduates and doctors,100,52,46,43,32,0,51,3,71, Notas: Fuente: National Statistics Institute