Quality specifications for ordinal scale measurements with multiproperty (multiple) urine test strips

Analytical quality specifications for ordinal scale measurements have not b een presented so far. Criteria are suggested for multiproperty (multiple) u rine test strips based on upper limits of healthy reference intervals, anal ytical performance and statistical tests applicable to ordinal scales. True ness (accuracy) can be evaluated against an acceptable comparison method by applying sensitivity and specificity concepts, and defining a grey zone wi th a lower detection limit and an upper confirmation limit. Concordance (ag reement) of two or more ordinal scale categories should be evaluated by sub tracting random agreement, using Kappa statistics. Repeatability (precision ) can be calculated for categorized results using binomial statistics.