Table 5

Associations between oral symptoms and unstimulated saliva flow test: subjects aged under and over 55 years

	Abnormal unstimulated saliva flow rate?
	Subjects aged under 55 years				Subjects aged over 55 years
	Yes	No			PPV	NPV	LR (95% CI)^5-150	Yes	No	PPV	NPV	LR (95% CI)^5-150
+ve Oral symptoms?
Yes	19	33	0.37	0.84	2.20		19	20	0.49	0.58	1.20
No	25	135			(1.9, 2.5)		30	42			(0.6, 2.4)
+ve Ocular and oral symptoms?
Yes	13	13	0.50	0.83	3.82		12	9	0.57	0.58	1.66
No	31	155			(3.2, 4.5)		37	52			(0.9, 3.0)

↵5-150 LR (95% CI)=likelihood ratio (95 % confidence intervals). Abbreviations as in Table 3.