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Fig. 11. —Graphs representing mean (± SEM) number of discrepancies in identifying abnormalities of posterior ethmoid cells (Fig. 9), basal lamina (Fig. 10), and periodontal space (Fig. 11). X-axis represents sets of comparisons: 1, two-by-two comparisons between pairs of reviewers at both sessions interpreting low-dose multidetector CT (MDCT) scans; 2, two-by-two comparisons between pairs of reviewers at both sessions interpreting standard-dose MDCT scans; 3, intrareviewer comparisons between two interpretation sessions of low-dose MDCT scans; 4, intrareviewer comparisons between two interpretation sessions of standard-dose MDCT scans; 5, comparisons between interpretations of low- and standard-dose MDCT scans for each reviewer and for both interpretation sessions. In cases of statistically significant discrepancies, p values from Tukey tests [24] are given. Solid line represents significant difference involving comparisons of low-dose and standard-dose scans among reviewers. Dashed line represents significant difference involving another comparison. Vertical bars extending on either side of mean point represent range.