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: