Figure 1. Sensitivity changes over time. Box plot where the box length is the interquartile range with the median identified as a thick black line traversing the box. Outliers(ringed) are cases with values between 1.5 and 3 box lengths from the upper or lower edge of the box. From SPSS v11.5.
Figure 2. Specificity changes over time. Box plot where the box length is the interquartile range with the median identified as a thick black line traversing the box. Outliers(ringed) are cases with values between 1.5 and 3 box lengths from the upper or lower edge of the box. From SPSS v11.5.