Table 1

Characteristics of primary Sjögren's syndrome, nonprimary Sjögren's syndrome sicca and control subjects

Characteristic

pSS (n = 24)

Non-pSS sicca (n = 16)

Controls (n = 25)

Age (years)

49.0 ± 15.8

52.8 ± 15.4

59.0 ± 12.0

Female:male

21:3

13:3

12:13

Ethnicity

24 Caucasian

16 Caucasian

25 Caucasian

Unstimulated whole saliva (ml/minute)

0.10 ± 0.14

0.12 ± 0.18

NA

Stimulated whole saliva (ml/minute)

0.31 ± 0.35

0.33 ± 0.40

NA

Schirmer's test (mm)

9.2 ± 7.6

14.8 ± 11.7

NA

Focal score

3.5 ± 1.2

0.5 ± 1.0

0

Sjögren's syndrome - A (positive:negative)

23:1

2:14

0:25

Sjögren's syndrome - B (positive:negative)

19:5

0:16

0:25

Data presented as the mean ± standard deviation. All primary Sjögren's syndrome (pSS) and non-pSS sicca patients were subjected to a complete American-European Consensus Group diagnostic work-up. NA, not assessed (in controls being head and neck cancer patients without parotid involvement, no functional tests were performed as all these patients were already scheduled for a neck dissection and functional tests were considered too much of a burden to the patients at that time).

Horvath et al. Arthritis Research & Therapy 2012 14:R238   doi:10.1186/ar4081