Table 4. Sensitivity, specificity, PPV and NPV of each pointer in patients with different diagnosis.

Final diagnosis	Clinical characteristics	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
CVA	Sports-related cough	94.1	38.8	60.6	86.8
	Non-productive cough	82.4	48.0	61.3	73.2
	Nocturnal cough	64.7	85.4	81.5	70.7
	Atopy	64.7	64.6	64.6	64.6
	Season-related cough	35.3	64.6	49.9	50.0
	Cough in the morning	23.5	35.4	26.7	31.6
	Cough before sleep	11.8	56.2	21.2	38.9
	Productive cough	17.6	52.1	26.9	38.7
UACS	Cough before sleep	48.6	82.1	73.1	61.5
	pharyngeal positive signs	81.1	57.1	65.4	75.1
	Cough in the morning	70.3	67.9	68.7	69.6
	Productive cough	54.1	78.6	71.7	63.1
	Sports-related cough	62.2	17.9	43.1	32.1
	Atopy	37.8	50	43.1	44.6
	Nocturnal cough	10.8	50.0	17.8	35.9
	Non-productive cough	45.9	21.4	36.9	28.3

CVA, cough variant asthma; UACS, upper airway cough syndrome; PPV, positive predictive value; NPV, negative predictive value.