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. 2017 Jul 26;78(4):588–596. doi: 10.15288/jsad.2017.78.588

Figure 1.

Figure 1.

Sensitivity analysis of the potential impact of an unobserved confounder, U, on the association of quality indicators and mortality. P0: Prevalence of U among those not receiving the quality measure. P1: Prevalence of U among those receiving the quality measure. Shaded areas represent combinations of P1, P0, and OR(U) that would result in a loss of significance of the quality indicator–mortality association. From darkest to lightest gray: OR(U) = 2.14, 1.59, 1.41, 1.14. Areas with no shading remained significant for selected OR(U) values.