Survey on Human Resources in Science and Technology Personal characteristics of the doctorate-holders Type of centre in which the doctorate-holder undertook her/his studies prior to the university studies, according to socio-economic origin. Units: percentage ;Primary Education;;;Secondary Education/ VT II;;;Post-Secondary Education;;; ;Public;Semi-private;Private;Public;Semi-private;Private;Public;Semi-private;Private; Total;43.01;27.27;29.72;49.90;21.94;28.15;55.95;16.60;27.45; Military occupations;1.97;0.96;1.31;2.37;0.71;1.15;2.47;0.62;1.15; Directors and managers;1.46;2.05;3.15;2.11;1.78;2.78;2.59;1.38;2.69; Scientific and intellectual professionals;13.16;10.81;13.72;15.68;8.88;13.12;17.52;7.10;13.06; Intermediate-level technicians and professionals;1.15;1.14;1.76;1.55;0.95;1.54;1.90;0.64;1.51; Administrative support personnel;3.56;2.46;2.47;4.32;2.05;2.12;5.03;1.48;1.98; Workers in services and salespersons in shops and markets;5.97;4.09;3.14;6.97;3.08;3.15;7.93;2.18;3.09; Farmers and qualified livestock and fishing workers;4.58;0.86;0.84;4.42;0.95;0.92;4.59;0.77;0.93; Skilled workers, operators and artisans of mechanical arts and other trades;5.90;2.93;2.07;6.56;2.24;2.10;7.61;1.38;1.92; Installation and machinery operators and assemblers;1.79;0.66;0.36;1.98;0.47;0.37;2.13;0.37;0.31; Elementary occupations;3.48;1.29;0.89;3.94;0.83;0.89;4.17;0.69;0.80; Notes: Source: National Statistics Institute