Encuesta de Fecundidad Knowledge and use of contraceptions. Fem. between 15-49 Females between 15 and 49 years level of studies contraceptive practices. Units: relative figures ;Total;Never has used method;Has used before, but not currently;Currently use one efficient method;Currently use one inefficient method; Total;100.00;27.44;16.28;53.17;3.11; Illiterate;100.00;28.78;22.66;25.82;22.74; Without studies;100.00;23.42;18.28;48.97;9.34; Primary education and second grade, GBE or first year of GCSE;100.00;27.57;16.45;51.84;4.14; Secondary Education and Post-secondary non-higher;100.00;35.38;12.92;50.61;1.09; 1º, 2º and intermediate technical-professional studies;100.00;23.03;16.81;57.06;3.11; Higher level technical-professional studies;100.00;26.20;4.82;68.97;..; First year of tertiary education;100.00;25.16;17.72;55.34;1.78; Tertiary education, university graduates and doctors;100.00;20.07;20.44;58.27;1.22; Notes: Source: National Statistics Institute