Encuesta de Fecundidad Knowledge and use of contraceptions. Fem. between 15-49 Females between 15 and 49 years, use or have used contraceptions level of studies medical advice for use of contraceptions. Units: relative figures Total Does not visit a medical center Visits a public center Visits a private center Total 100.00 48.63 33.74 17.63 Illiterate 100.00 91.20 8.80 .. Without studies 100.00 53.17 38.22 8.61 Primary education and second grade, GBE or first year of GCSE 100.00 48.36 36.47 15.16 Secondary Education and Post-secondary non-higher 100.00 47.59 31.34 21.07 1º, 2º and intermediate technical-professional studies 100.00 48.02 34.56 17.42 Higher level technical-professional studies 100.00 55.48 22.74 21.78 First year of tertiary education 100.00 45.89 31.39 22.72 Tertiary education, university graduates and doctors 100.00 52.07 25.43 22.50 Notes: Source: National Statistics Institute