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Mediational analyses. The effect of Beta-2 adrenergic receptor (ADRB2) rs1042714 genotype on health-related quality of life (HRQOL). Standard correlation coefficients for each of the variables are shown, with unstandardised regression coefficients reported in parentheses. Sobel tests provide the overall significance of the putative mediational model (*P < 0.05; **P < 0.01; ***P < 0.001).
