Table 2.

Results of ultrasound grading and resistive index (RI) in the population at baseline and M3

	M0 (baseline) mean ± SD (min–max)	M3 mean ± SD (min–max)	p value
Left PG length (cm)	4.66 ± 0.94 (3.58–6.41)	5.42 ± 1.07 (3.23–6.99)	0.260
Right PG length (cm)	4.51 ± 1.07 (2.86–5.92)	5.08 ± 1.20 (3.13–6.86)	0.327
Left SMG length (cm)	2.98 ± 0,78 (1.48–4.29)	2.84 ± 0 .67 (2.00–4.45)	0.213
Right SMG length (cm)	2.78 ± 0.90 (1.46–4.27)	3.09 ± 0.78 (1.69–4.04)	0.123
Left PG grade*	1.09 ± 1.58 (0–4)	1.20 ± 1.55 (0–4)	1
Right PG grade*	1 ± 1.61 (0–4)	1.10 ± 1.60 (0–4)	1
Left SMG grade*	0.73 ± 1.35 (0–4)	0.82 ± 1.47 (0–4)	0.317
Right SMG grade*	0.73 ± 1.35 (0–4)	0.91 ± 1.45 (0–4)	0.157
Left PG OGrade	1 ± 1.247	1 ± 1.155	1
Right PG OGrade	0.9 ± 1.287	0.9 ± 1.197	1
Left SMG OGrade	0.64 ± 1.120	0.73 ± 1.272	0.341
Right SMG OGrade	0.64 ± 1.120	0.82 ± 1.250	0.167
Sum of four glands grades*	4.33 ± 6.12 (0–16)	4.56 ± 6.23 (0–16)	0.450
Sum of four glands OGrades	3.3 ± 4.764	3.6 ± 4.76	0.434
RI at baseline	0.76 ± 0.09 (0.51–0.87)	0.80 ± 0.07 (0.73–0.92)	0.721
RI after stimulation	0.73 ± 0.15 (0.35–0.90)	0.76 ± 0.10 (0.61–0.94)	0.953
RI 1 min after stimulation	0.72 ± 0.11 (0.47–0.85)	0.80 ± 0.06 (0.71–0.89)	0.260
Difference between RI after and before stimulation	− 0.05 ± 0.09 (− 0.19–0.05)	− 0.04 ± 0.13 (− 0.25–0.19)	0.799

SD standard deviation, min minimum, max maximum, RI resistive index, PG parotid gland, SMG submandibular gland

*Grading system using previous scoring system [17]; Ograde: grading using new OMERACT scoring system