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Saliva surface tension (mN/m) in subjects with primary Sjögren's syndrome and control subjects without Sjögren's syndrome. Patients with primary Sjögren's syndrome had significantly higher saliva surface tension than controls (*P < 0.05). Values are mean ± SEM. Primary Sjögren's syndrome evening, n = 7; primary Sjögren syndrome's morning, n = 8; controls at both collection times, n = 8.
