Fig. 1From: Broad external validation of a multivariable risk prediction model for gastrointestinal malignancy in iron deficiency anaemiaReceiver operating characteristic curve shows the sensitivity on y-axis, and specificity on x-axis for the Dorset (black), Oxford (dark grey), Sheffield (grey) and combined validation (dotted black) datasets with the highest GMean value in each dataset. AUC, area under curve; GMean, geometric mean of sensitivity and specificityBack to article page