Four-yearly Wage Structure Survey 
Sampling errors
Studies undertaken. National total
Unidades: %
;Both sexes;Females;Males;
        All studies;0,42;0,6;0,67;
        I. Less than Primary;5,79;7,9;6,78;
        II. Primary education;1,38;2,26;1,59;
        III. First stage of secondary education;1,14;1,49;1,5;
        IV. Second stage of secondary education;1,13;1,3;1,58;
        V. Higher-level vocational training courses and similar;1,36;2,05;1,71;
        VI. University graduates and the like;1,39;1,5;2,28;
        VII. Graduates and similar, and university doctors;1,33;1,51;1,91;
Notas:
Fuente: