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