This explanation isn't nearly as fun as all the wild speculation we're all posting below you.
+1 for actually hunting down the original study and interpreting it.
-1000 for spoiling our self-righteous party.
+1 for actually hunting down the original study and interpreting it.
-1000 for spoiling our self-righteous party.
Even with the resulting edit there appears to be, at least to me, a clear need for additional investigation utilizing non-Norwegian conscription data before the original research question can be validated.