Encuesta de Fecundidad Characteristics marriages / couples and exposure to pregnancy risk. Women 15-49 years Females married sometime or with a partner level of studies age to 1st marriage or with a partner. Unidades: Relative figures Total Under 20 years old From 20 to 24 years old From 25 to 29 years old From 30 to 34 years old years old and over Total 100 41,87 36,51 17,36 3,18 1,08 Illiterate 100 62,95 33,79 2,69 .. 0,57 Without studies 100 40,9 46,9 9,17 2,05 0,99 Primary education and second grade, GBE or first year of GCSE 100 36,03 45,58 15,16 2,29 0,93 Secondary Education and Post-secondary non-higher 100 54,38 27,19 14,38 2,99 1,06 1º, 2º and intermediate technical-professional studies 100 46,78 32,09 18,2 2,6 0,33 Higher level technical-professional studies 100 55,8 22,77 19,77 1,66 .. First year of tertiary education 100 36,33 30,2 26,99 4,92 1,56 Tertiary education, university graduates and doctors 100 43,41 16,29 28,79 8,57 2,95 Notas: Fuente: National Statistics Institute