Encuesta de Fecundidad Knowledge and use of contraceptions. Fem. between 15-49 Females between 15 and 49 years, non knowledge of contraceptions level of studies number of live births. Units: relative figures ;Total;None;One;Two;Three;Four;Five and more; Total;100.00;60.56;9.32;18.99;8.64;1.32;1.16; Illiterate;100.00;73.94;..;..;..;..;26.06; Without studies;100.00;..;..;52.05;..;47.95;..; Primary education and second grade, GBE or first year of GCSE;100.00;60.53;11.56;19.50;8.42;..;..; Secondary Education and Post-secondary non-higher;100.00;77.09;6.11;1.68;15.11;..;..; 1º, 2º and intermediate technical-professional studies;100.00;66.73;..;33.27;..;..;..; Higher level technical-professional studies;..;..;..;..;..;..;..; First year of tertiary education;100.00;49.00;18.66;..;32.34;..;..; Tertiary education, university graduates and doctors;..;..;..;..;..;..;..; Notes: Source: National Statistics Institute