Survey on International Mobility of Students SAMPLING ERRORS Sampling errors relative to persons from 18 to 34 by age group and cases of mobility in volunteer activities Units: Coefficient of variation ;Moved abroad;Did not move abroad; TOTAL;6.75;0.14; 18 to 24 years old;11.91;0.22; 25 to 29 years old;11.77;0.27; 30 to 34 years old;11.14;0.25; Notes: 1) Mobility: Moving abroad for study or training Source: INE