63 Differences in perceived intra-oral dryness Relationship between the Regional Oral Dryness Inventory and the Xerostomia Inventory in various dry-mouth patient groups Table 7 presents the Spearman’s correlation between the intra-oral region scores of the RODI and the total XI scores for the six patient groups. The XI scores of controls, LowMed patients, and High Med patients correlated significantly with all eight intra-oral regions (Spearman’s rank test, p < 0.01). The correlation coefficients of these three patient groups ranged between 0.43 and 0.66 and can be viewed as representing fair to moderate correlations. The XI scores of RTX patients correlated significantly with only three regions: the anterior palate and the anterior and posterior tongue (Spearman’s rank test p < 0.05). These regions had a moderate to very strong correlation with the total XI scores (correlation coefficients between 0.69 and 0.78). For SS patients, all regions except for the upper lip correlated significantly with total XI scores. The correlation coefficients of these regions ranged between 0.34 and 0.68. As for SS + High Med patients, only the following four regions correlated significantly with the total XI scores: the upper lip, the lower lip, the inside cheeks, and the floor of the mouth. Their correlation coefficients ranged between 0.57 and 0.63, which can be viewed as representing fair to moderate correlation. Taken together, these results suggest that the correlations between the total XI scores of controls, Low Med, and High Med patients and all eight intra-oral regions of the RODI can be considered as fair to moderate. On the other hand, RTX, SS, and SS + High Med patients had only a small number of intra-oral regions that correlated significantly with the total XI scores. However, these correlations were stronger than the correlations of controls, Low Med, and High Med patients. 3
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