Survey on Human Resources in Science and Technology Personal characteristics of the doctorate-holders Professional level of the parents of the doctorate-holders. Units: percentage ;Father;Mother; Total;100.00;100.00; Military occupations;4.24;0.03; Directors and managers;6.39;0.81; Scientific and intellectual professionals;34.59;18.96; Intermediate-level technicians and professionals;4.54;0.50; Administrative support personnel;7.79;7.36; Workers in services and salespersons in shops and markets;12.84;8.05; Farmers and qualified livestock and fishing workers;6.66;2.45; Skilled workers, operators and artisans of mechanical arts and other trades;13.25;2.40; Installation and machinery operators and assemblers;3.41;0.48; Elementary occupations;6.30;7.77; S/he has never worked;0.00;51.19; Notes: Source: National Statistics Institute