Effect of proportion elective procedure on percent bias. Effect of the proportion of participants who undergo an elective procedure on percent bias in observed sensitivity (A) and specificity (B). Note that the scale of the y-axis of the specificity graph (B) is enlarged to show minute changes. Parameter definitions are as in "Parameters" (Table 6), except that the proportion elective procedure is allowed to vary. Otherwise as Figure 3.
Ringham et al. BMC Medical Research Methodology 2010 10:3 doi:10.1186/1471-2288-10-3