Statistics on the Wage of Persons with Disabilities Sampling errors: variation coefficients for the annual earnings per worker variable Degree of disability Unidades: coefficient of variation Total Total 2,43 33% to 44% 2,7 45% to 64% 5,05 65% and over 8,74 No data recorded 10,14 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