Nine-point scale where 1–3=inappropriate, 4–6=neither appropriate nor inappropriate, 7–9=appropriate | Number of panellists rating this criterion (n=15) | Calculations, interpercentile range method41 | Interpretation |
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1 2 3 4 5 6 7 8 9 | 1 1 1 5 5 2 Median=7.0 | 30th percentile=7.0 70th percentile=8.0, interpercentile range (IPR)=70th−30th percentile)=1.0, IPR central point (IPRCP)=30th+70th percentile divided by 2=7.5 Asymmetry index (AI)=(5−IPRCP) (as an absolute value)=2.5 IPRAS=(2.5+(AI×1.5))=6.1, where 2.5 is the IPR required for disagreement when perfect symmetry exists, and 1.5 is the correction factor for asymmetry | This criterion was accepted according to the median method because four or less panellists voted outside the three-point region containing the median The IPRAS (6.1) was greater than the IPR (1.0) indicating no disagreement. The larger the IPRAS, the less asymmetric the ratings |