pSS patients (n= 15) Controls (n= 15)
Metabolite Concentration (µM) Concentration (µM)

Significance
P value (a)

Mean  ±  S.D Range

P value (a)

Range
Acetate 1482.7 ± 952.6 202.7-3676.6 1503.0 ± 715.2 670.6-3035.2 0.948
Alanine 23.7 ± 13.2 7.0-55.6 11.4 ± 7.3 2.5-27.6 0.004**
Butanol 14.1 ± 12.1 1.5-45.1 8.6 ± 5.8 0.8-20.7 0.126
Butyrate 34.7 ± 29.0 7.2-107.8 16.4 ± 10.9 2.5-34.9 0.034*
Choline 11.4 ± 5.3 4.5-24.7 4.1 ± 2.0 1.0-7.1 <0.001***
Citrate 18.3 ± 7.9 7.2-34.4 18.3 ± 13.8 3.4-46.5 0.996
Ethanol 25.4 ± 12.8 7.2-57.7 26.3 ± 59.6 7.9-241.3 0.956
Formate 152.0 ± 195 6.3-660.8 80.1 ± 63.3 3.3-220.5 0.192
Fucose 46.5 ± 35.9 3.7-113.6 66.3 ± 40.3 20.2-150.5 0.167
Glycine 150.9 ± 120.5 16.0-387.7 51.5 ± 35.4 8.7-152.3 0.007**
Histidine 30.3 ± 13.9 8.7-53.8 - - -
Isopropanol 1.84 ± 0.8 0.2-3.7 - - -
Lactate 265.6 ± 140.4 25.4-509.7 198.3 ± 174.5 14.1-649.0 0.255
Methanol 28.5 ± 17.5 9.7-65.6 27.7 ± 9.2 8.3-43.9 0.878
Methylamine 2.1 ± 1.7 0.5-5.7 2.0 ± 0.9 1.1-3.8 0.818
Phenylalanine 14.3 ± 8.4 2.6-28.6 8.5 ± 3.6 2.6-16.8 0.026*
Proline 133.5 ± 114.5 9.1-362.9 59.1 ± 44.1 17.8-160.5 0.032*
Propionate 284.3 ± 205.7 49.8-722.1 235.7 ± 156.2 69.0-621.9 0.472
Pyruvic acid 17.6 ± 11.2 0.9-37.5 10.4 ± 7.8 0.0-24.3 0.050
Succinate 33.8 ± 32.1 6.7-131.8 28.2 ± 15.7 5.3-49.5 0.549
Taurine 110.5 ± 49.6 18.6-213.0 48.3 ± 29.0 12.5-111.5 <0.001***
Trimethylamine 1.4 ± 1.4 0.1-4.9 - - -
Tyrosine 26.7 ± 18.5 5.1-75.4 19.6 ± 11.4 6.4-50.5 0.215
1,2-propanediol 40.1 ± 71.4 9.2-290.0 27.3 ± 14.2 9.8-59.0 0.500
(a)Student’s t-test; p< 0.001***; p<0.01**; p<0.05*
Table 1: Comparison of salivary metabolite concentrations between primary Sjögren’s syndrome (pSS) patients and healthy controls.