Salivary gland ultrasonography in primary Sjögren’s syndrome from diagnosis to clinical stratification: a multicentre study

Table 1 Characteristics of the study population

Characteristics	pSS patients (n=246)	Non-pSS subjects (n=167)
Characteristics	pSS patients (n=246)	Healthy subjects (n=27)	Non-pSS patients (n=140)
Age, mean (S.D.), years	53.16 (12.13)	51.21 (13.72)
Female/male	239/7	156/11
Symptom duration Median (range), years	4 (0.1–31)*	0	2 (0.1–30)
Parotid enlargement	75 (30.5)*	0	3 (2.1)
Dental loss	95 (38.6)*	0	4 (2.9)
Schirmer <5 mm^a	128/129*	0	17/33
Anti-SSA^a	176/223*	0	44/130
Anti-SSB^a	89/224*	0	15/125
MSG biopsy^a	37/52*	0	0/1

Except where indicated otherwise, the values are presented as the mean (S.D.), median (range) or number (%). ^aValues of objective tests given as rates of positive results (positive/total). The p values were determined using the Mann-Whitney test or chi-square test, as appropriate; *P < 0.05: statistically significant (regarding the difference between pSS patients and non-pSS subjects). MSG minor salivary gland

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