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Three editorial errors occurred in this paper by Dr R De Vogli and others (2005;59:158–62). In the third line of the legend to figure 1 it should read r (crude) = −0.607 [not 0.607]. In the fifth line of the legend to figure 1 it should read r (weighted by population size) = −0.658 [not 0.658]. In the fifth line of the legend to figure 2 it should read r (crude) = −0.415 [not 0.415].