National tables: studies, age and sex. Percentages Persons 18 to 49 years by sex, studies and preferred source of sexual information. Units: percentages ,Total,Old parents or relatives,Siblings or friends,Partner,Professionals,Various support,Nobody, Both sexes, Total,100.00,12.39,38.78,19.59,10.28,12.11,6.84, Lower than secondary education,100.00,11.89,35.39,24.63,7.69,9.86,10.55, Secondary education,100.00,13.06,39.42,17.49,12.44,12.61,4.98, University,100.00,12.20,44.24,13.53,11.46,15.61,2.96, Males, Total,100.00,10.56,43.92,14.98,9.90,13.30,7.34, Lower than secondary education,100.00,11.30,40.46,18.61,7.16,11.38,11.08, Secondary education,100.00,10.19,44.77,13.36,12.79,13.84,5.05, University,100.00,9.61,50.15,9.96,10.25,16.61,3.43, Females, Total,100.00,14.28,33.52,24.31,10.66,10.90,6.34, Lower than secondary education,100.00,12.54,29.74,31.34,8.27,8.15,9.96, Secondary education,100.00,16.15,33.66,21.93,12.07,11.29,4.90, University,100.00,14.27,39.53,16.37,12.42,14.82,2.59, Notes: Data corresponding to cells with less than 45,000 persons must be used with caution, because they may be affected by high sample errors. Source: National Statistics Institute