Medical observations and bias.

Many clinical and epidemiologic studies are based on different physicians' readings. A method to calibrate the various examinations is described. The standard reader's and others' results are plotted in a correlation diagram.

Evaluation of mortality data for cervical cancer with special reference to mass screening programs, Denmark, 1961-1971.

During the years 1961-1971, a total of 3696 women died in Denmark from cervical cancer. The annual mortality per 1000 was 0.23 and was constant in this period.