The estimation of Russian revision reproducibility of the chronic gastritis OLGA system International classification has been spent. The analysis of Russian pathologists-experts work, considered in estimations of an expression level and prevalence of gastric mucosal atrophic changes, as a tumour predictor, for the identification of chronic gastritis stages (0-IV) has been carried out by kappa-statistics. The different levels of experts' consent according to consent criteria calculation have been estimated. The criteria of consent (k) of leading Russian pathologists have been 0.5 (moderate level of the agreement). In the practice of histopathology researchers' classification a consent level has been lower--from 0.27 (satisfactory or tolerable consent level) to 0.42 (moderate or average consent level). A subjective reasons reducing consistency level of pathologists-experts have been discussed.
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