Hi Cort and others,
Fine idea, and the first to attempt to say it with statistics on this site also, I think.
There are some difficulties, as other posters mentioned, which ought to be surmountable but addressed, one of which are these, in itself fairly interesting, topics:
* The differences between social benefits for being ill without work in various countries
* The differences between health insurances and help one may get
These seem to me to be fairly large, which makes comparisons between persons from different nations a bit ... problematic.