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International Journal of Epidemiology 2001;30:1405-1406
© International Epidemiological Association 2001

Socioeconomic factors

Commentary: Income and health: why are curves so appealing?

Geoff Der

MRC Social & Public Health Sciences Unit, University of Glasgow, 4 Lilybank Gardens, Glasgow G12 8RZ, Scotland.

In this issue of the International Journal of Epidemiology Martikainen et al.1 report a linear relationship between household income and subsequent mortality. The linear trend accounts for ‘96% of the variation between income deciles’. Departures from linearity at the top and bottom of the income range are modest and variable—the most consistent being a flattening of the relationship at very high incomes. These results contrast markedly with the most directly comparable study of Backlund et al.2 which found pronounced curvilinearity, flattening at much lower income levels.

The first point to stress about this difference is that it is very unlikely to be due . . . [Full Text of this Article]

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