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Background and Objective: The survival-agreement plot was proposed andimproved to assess the reliability of a quantitative measure. We propose theuse of survival analysis as an alternative non-parametric approach forcomparison of ordinal qualitative data.  Study Design and Setting: Two case studies were presented. The first one isrelated to a randomized, double blind, placebo-controlled clinical trial toinvestigate the safety and efficacy of silymarin/metionin for chronic hepatitisC. The second one is a prospective study to identify gustatory alterations dueto chorda tympani nerve involvement in patients with chronic otitis mediawithout prior surgery.  Results: No significant difference was detected between the two treatmentsrelated to the chronic hepatitis C (p > 0.5). On the other hand, a significantassociation was observed between the healthy side and the affected side of theface of patients with chronic otitis media related to gustatory alterations (p< 0.05).  Conclusion: The proposed method can serve as an alternative procedure tostatistical test for comparison of samples from ordinal qualitative variables.This approach has the advantage of being more familiar to clinical researchers.

Using survival curves for comparison of ordinal qualitative data in clinical studies