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