Four-yearly Wage Structure Survey 
Sampling errors
Main NCO-11 groups. National total
Units: %

All occupations;0.37;
A. Directors and managers;3.89;
B. Health and education-related scientific and intellectual technicians and professionals;1.82;
C. Other scientific and intellectual technicians and professionals;1.47;
D. Technicians, support professionals;1.07;
E. Office employees that do not provide customer service;1.37;
F. Office employees that provide customer service;1.96;
G. Workers in catering and trade services;1.49;
H. Workers in health and personal care services;1.62;
I. Workers in protection and security services;4.31;
J. Skilled agricultural, livestock, forestry and fishing sector workers;7.85;
K. Skilled construction workers, except machinery operators;1.83;
L. Skilled workers in the manufacturing industries, except installation and machinery operators;1.28;
M. Installation and fixed machinery operators and assemblers;1.55;
N. Mobile machinery drivers and operators;1.87;
O. Unskilled workers in services (except transport);1.42;
P. Agricultural, fishing, construction, manufacturing and transport industry labourers;1.88;
Notes:
Source: National Statistics Institute