Figure 2

Estimates of diagnostic accuracy of the D-dimer test and calf difference test for the 100 nested case-control samples with case-control ratios ranging from 1:1 to 1:4. The boxes indicate mean values and corresponding interquartile ranges (25^th and 75^th percentile). Whiskers indicate 2.5^th and 97.5^th percentiles. The dotted lines represent the values estimated in the full study population.