Fig. 1

Mosaic plot of the staging and grading for each case among the participants (total sample = 64; participants with a periodontal background = 31; participates with a nonperiodontal background = 33). Note: The p-value for Fisher’s exact test is reported on top of each panel. The height of each box represents the proportion of each response category within a group, and the numbers in boxes represent the corresponding counts. The correct response categories are shown in gray. N/A refers to “not answered”