Figure 4

a–b Contingency tables of frequency distribution of discrete VAS records relative the VRS on a) the unbiased five-category VAS (v0–v4) relative the VRS (0–4) and b) the equidistant five category VAS (v0–v4) versus the discrete five category VRS (0–4) in patients with nociceptive pain. Agreeing pairs of data are shown in the grey shaded main diagonal.