Encuesta de Fecundidad Knowledge and use of contraceptions. Fem. between 15-49 Females between 15 and 49 years, married sometime 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;8.80;21.69;64.77;4.74; Illiterate;100.00;25.24;29.77;12.79;32.21; Without studies;100.00;18.85;19.79;53.10;8.26; Primary education and second grade, GBE or first year of GCSE;100.00;10.44;20.85;62.73;5.98; Secondary Education and Post-secondary non-higher;100.00;6.01;21.60;69.65;2.74; 1º, 2º and intermediate technical-professional studies;100.00;5.35;21.33;70.71;2.61; Higher level technical-professional studies;100.00;3.01;18.74;78.25;..; First year of tertiary education;100.00;5.24;24.99;67.00;2.77; Tertiary education, university graduates and doctors;100.00;6.01;26.53;65.43;2.03; Notes: Source: National Statistics Institute