Statistics on the Wage of Persons with Disabilities SAMPLING ERRORS: COEFFICIENT OF VARIATION FOR THE VARIABLE 'GROSS EARNING PER WORKER' Age group Units: coefficient of variation ,Total,Persons without disabilities,Persons with disabilities, Total,0.42,0.43,2.43, 16 to 29 years old,1.40,1.41,8.36, 30 to 44 years old,0.68,0.68,5.20, 45 years old and older,0.73,0.75,2.61, Notes: 1) 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. Source: Spanish National Statistics Institute