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Figure 4 | BMC Medical Research Methodology

Figure 4

From: Lack of interchangeability between visual analogue and verbal rating pain scales: a cross sectional description of pain etiology groups

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.

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