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Example of the rank method. Samples (circles) from Group A (white circles) and Group B (black circles) are combined (top row) for examination. The samples are then ranked in order of lesion severity (represented by circle diameter, bottom row). The rank numbers for Group A (1,2,3,4,7,8) and Group B (5,6,9,10,11,12) are then analyzed. P=0.03, Mann-Whitney test.
