PEDIATRICS Vol. 79 No. 4 April 1987, pp. A105
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STANDARDS FOR ORDINAL SCALES

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Ordinal scales are frequently used in clinical trials to quantify outcomes which are non-dimensional [for example 1+ to 4+ system for assessing peripheral oedema].... Guidelines for construction and utilisation of ordinal scales as measures of outcome in clinical trials have not been formulised. In this paper a set of standards are developed.