Survey on International Mobility of Students International Mobility in CNED 3 or 4 (Second stage of secondary and non-higher post-secondary education) Persons from 18 to 34 years old with cases of mobility in CNED 3 or 4 by duration of the stay Units: Thousands of persons Total,58.0, More than 6 months,27.5, From 3 months to 6 months,9.3, Less than 3 months,21.2, Notes: 1) Mobility: Moving abroad for study or training 2) CNED 3: Second stage of Secondary Education. CNED 4: Non-higher post-secondary education Source: INE