[Methods of assessing the state of the digestive system in mass examinations of rural population].

On the basis of physician's logic a questionnaire has been elaborated for identifying the most common diseases of digestive system during mass medical check-ups of rural population. 98 combinations of signs were considered in the diagnostic algorithm for making conclusions regarding 11 diseases. The programme elaborated envisages recommendations on the volume of examinations necessary for verification of diagnoses. The questionnaire and rules governing it were verified for 152 patients. By means of mathematical statistics methods the informativeness of the signs used have been assessed. The analysis showed a great diagnostic value of choosing signs on the basis of physician's logic taking into account their pathogenetic correlation. The efficiency of questionnaires have been demonstrated and sufficient under conditions of automated examinations sensitivity (on the average for diseases 78.1%) and specificity (on the average for diseases 70.0%).