56 Chapter 3 Table 2 Patient characteristics for the total study sample. The total N differs because some data were missing for some patients. The total XI scores, the unstimulated whole saliva (UWS), chewingstimulated whole saliva (CH-SWS), acid-stimulated whole saliva (A-SWS) flow rate (mL/min), and salivary pH of the study sample. Data are expressed as the median with the corresponding interquartile range (IQR) and as a mean with standard deviation (SD). Saliva Mean ± SD Median ± IQR Number of subjects UWS Flow rate (mL/min) 0.21 ± 0.21 0.16 ± 0.07–0.30 434 pH 6.38 ± 0.56 6.50 ± 6.10–7.00 416 CH-SWS Flow rate (mL/min) 0.76 ± 0.62 0.60 ± 0.30–1.10 446 pH 6.75 ± 0.58 7.00 ± 6.50–7.00 444 A-SWS Flow rate (mL/min) 1.28 ± 0.92 1.11 ± 0.57–1.80 450 pH 4.91 ± 1.04 4.60 ± 4.00–5.50 450 XI total score 31.8 ± 11.4 32.0 ± 23.0–40.0 507 Table 3 Perceived oral dryness in eight different intra-oral regions as determined with the Regional Oral Dryness Inventory (RODI) in the total study sample. Data are presented as median with corresponding interquartile range (IQR) and as a mean with standard deviation (SD). Mean ± SD Median ± IQR Total number of subjects for each intra-oral region Upper lip 2.84 ± 1.28 3.00 ± 2.00–4.00 449 Posterior part of palatea 3.04 ± 1.30 3.00 ± 2.00–4.00 456 Anterior part of palateb 2.88 ± 1.31 3.00 ± 2.00–4.00 444 Inside cheeksa,b,c 2.51 ± 1.32 2.00 ± 1.00–4.00 447 Lower lipb,d 2.84 ± 1.30 3.00 ± 2.00–4.00 448 Anterior part of tonguea,d,e 2.96 ± 1.33 3.00 ± 2.00–4.00 445 Posterior part of tongued,e 2.99 ± 1.37 3.00 ± 2.00–4.00 452 Floor of the moutha,b,c,e,f,g 2.58 ± 1.35 3.00 ± 1.00–4.00 445 a Wilcoxon signed-rank tests: p < 0.05 vs. upper lip b Wilcoxon signed-rank tests: p < 0.05 vs. posterior palate c Wilcoxon signed-rank tests: p < 0.05 vs. anterior palate d Wilcoxon signed-rank tests: p < 0.05 vs. inside cheeks e Wilcoxon signed-rank tests: p < 0.05 vs. lower lip f Wilcoxon signed-rank tests: p < 0.05 vs. anterior part of the tongue g Wilcoxon signed-rank tests: p < 0.05 vs. posterior part of the tongue
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