Many thanks to William Hart, Ted Snowdown, Michel Camus and
Henry Silvert on the subject of using income quintiles versus income
quartiles when studying social class.

Very useful comments where made on:

a) differences between social class and socio-economic status
b) country-specificity of social class and socio-economic status
c) the problem of approaching socio-economic status being one of content
more than scale.
d) useful references an

Carlos Matias Dias
Centro de Epidemiologia e Bioestatística
Observatório Nacional de Saúde
Instituto Nacional de Saúde Dr. Ricardo Jorge
Av. Padre Cruz 1699 Lisboa codex

Telef: + 01 7510535
Fax: + 01 7573671
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