PEDUC							     ISCED97	   LIS recode
  0  pre-primary education							1
  1  primary education								1
  2  lower secondary education							1
  3  upper secondary education							2
  4  upper secondary, final year						2
  5  post-secondary non-tertiary education					2
  6  first stage of tertiary education, undergraduate level			3
  7  first stage of tertiary education, graduate level				3
  8  second stage of tertiary education						3
  9  unspecified								9