Encuesta de Fecundidad Characteristics marriages / couples and exposure to pregnancy risk. Women 15-49 years Females between 15 and 49 years level of studies actual age (years). Unidades: Relative figures ;Total;From 15 to 19 years old;From 20 to 24 years old;From 25 to 29 years old;From 30 to 34 years old;From 35 to 39 years old;From 40 to 44 years old;From 45 to 49 years old; Total;100;13,03;15,65;15,86;15,56;14,7;13,22;11,97; Illiterate;100;..;3,01;18;23,04;5,56;11,79;38,59; Without studies;100;4,4;..;2,1;11,63;16,7;23,85;41,33; Primary education and second grade, GBE or first year of GCSE;100;17,02;8,09;11,58;14,79;15,81;16,9;15,81; Secondary Education and Post-secondary non-higher;100;20,43;29,88;13,47;10,26;11,35;7,27;7,34; 1º, 2º and intermediate technical-professional studies;100;6,13;24,61;22,04;19;13,67;8,45;6,1; Higher level technical-professional studies;100;5,24;24,55;43,38;12,93;10,7;2,42;0,78; First year of tertiary education;100;0,11;16,83;21,58;20,83;16,48;13,68;10,49; Tertiary education, university graduates and doctors;100;0,19;11,38;30,02;21,91;16,71;13,11;6,68; Notas: Fuente: National Statistics Institute