We investigated the comparative study of the accuracy of the first reading shadow, the second reading shadow, and the third reading shadow in the Kanazawa-shi multi facilities endoscope medical examination. The item that we examined was cancer discovery rate, recall rate, positive-predictive value, and overlooking rate. The total of the endoscope medical examination was 52540 between 2008 and 2012, and the detected cancer was 172 examples (0.33%). Cancer discovery rate of the first reading

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... w was 0.30%, and recall rate was 1.1%, positive-predictive value was 29.2%, and overlooking rate was 8.7%. The second reading shadow each was 0.30%, 2.2%, 15.9%, and 7.6%.The third reading shadow each was 0.31%, 1.2%, 21.1%, and 4.7%. Recall rate of the first reading shadow was the lowest, and positive-predictive value of the first reading shadow was the highest. Overlooking rate of the third reading shadow was the best with significant difference. Overlooking rate of the second reading shadow was superior to the first reading shadow but there was not the significant difference. Recall rate and positive-predictive value of the second reading shadow were inferior together. The third reading shadow that was original method of Kanazawa-shi was useful from the above-mentioned point.