Table 2

Intraobserver and interobserver reliability of static ultrasound core items of PG and SMG: κ values

	Echogenicity	Homogeneity	Hyperechoic bands	Number of hypoechoic/anechoic areas*	Location of hypoechoic/anechoic areas	Number of abnormal nodes*	Normal nodes	Calcifications	Posterior border visibility	Diagnosis advice†
PG intraobserver
Mean	0.75	0.75	0.58	0.80	0.78	0.47	0.66	0.38	0.37	0.86
Min	0.43	0.29	0.00	0.57	0.59	0.00	0.44	−0.03	−0.11	0.52
Max	0.93	1	1	0.92	0.94	1	0.90	1	0.80	1
SMG intraobserver
Mean	0.61	0.63	0.61	0.76	0.69	0.17	0.45	0.42	0.41	0.70
Min	0.23	0.25	0.36	0.54	0.45	0.00	0.00	−0.05	0.00	0.33
Max	1	0.93	1	1	0.92	0.84	1	0.89	0.91	0.92
PG interobserver
Mean	0.60	0.66	038	0.74	0.77	0.19	0.54	0.10	0.15	0.78
Min	0.16	0.12	0.00	0.39	0.44	−0.06	0.25	−0.05	−0.38	0.31
Max	0.93	1	0.88	0.96	0.94	1	0.90	0.65	0.59	0.98
SMG interobserver
Mean	0.38	0.46	0.32	0.53	0.52	0.01	0.09	0.26	0.15	0.54
Min	0.01	0.01	0.00	0.22	0.07	−0.06	−0.11	0.00	−0.09	0.16
Max	0.92	0.93	0.79	0.90	0.92	0.27	0.67	1	0.65	0.91

*Quantitative variables were then categorised as follows: number of hypoechoic/anechoic areas: None (0), 1–4 (1), ≥5 (2); abnormal lymph nodes: No (0), Yes (1).
†Diagnosis advice was given in regard with the typical pattern of pSS on images and not in patients with pSS.
PG, parotid gland; pSS, primary Sjögren’s syndrome; SMG, submandibular gland.