Statistics on the Wage of Persons with Disabilities Sampling errors: variation coefficients for the annual earnings per worker variable Age group Unidades: coefficient of variation ,Total,Persons without disabilities,Persons with disabilities, Total,0,42,0,43,2,43, 16 to 29 years old,1,4,1,41,8,36, 30 to 44 years old,0,68,0,68,5,2, 45 years old and older,0,73,0,75,2,61, Notas: Persons with disabilities refers to persons formally recognised as disabled, with a degree of dissability of 33% or over, according to the procedure for evaluating this established in the RD 1971/1999 and modified by the RD 1856/2009. 2) When the box is marked with a '-' sign before the data, it indicates that the number of sample observations is between 100 and 500, so the figure is subject to great variability. Fuente: Spanish National Statistics Institute