Four-yearly Wage Structure Survey 
Sampling errors
Studies undertaken. National total
Unidades: %
	Both sexes	Females	Males	
	2018	2018	2018	
        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	
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