Survey on Adult Population Involvement in Learning Activities Formal and informal education. Percentage values Use of the knowledge acquired in the informal education activity, by sex and highest level of studies completed by the person carrying it out. Units: percentages ;Total;Very frequently;Somewhat frequently;Very infrequently;Never; BOTH SEXES; Total;100.00;52.22;33.00;10.51;4.28; First stage secondary education and lower;100.00;48.96;31.79;12.74;6.52; Intermediate-level studies;100.00;56.07;29.49;10.94;3.49; Tertiary level and university studies;100.00;52.08;35.26;9.16;3.50; MALES; Total;100.00;55.39;31.95;9.01;3.65; First stage secondary education and lower;100.00;53.09;32.49;9.31;5.11; Intermediate-level studies;100.00;59.47;26.60;10.28;3.65; Tertiary level and university studies;100.00;54.49;34.49;8.17;2.85; FEMALES; Total;100.00;49.12;34.02;11.97;4.89; First stage secondary education and lower;100.00;44.70;31.05;16.27;7.97; Intermediate-level studies;100.00;52.20;32.79;11.70;3.31; Tertiary level and university studies;100.00;49.95;35.93;10.04;4.08; Notes: 1) The Intermediate-level studies category is comprised of: Post-Secondary Education, intermediate-level technical-professional education. Data referring to the 12 months prior to the date of the survey. The symbol '.' shall be deemed as data which cannot be provided since it may be affected by sampling errors. Source: National Statistics Institute