Table 2. Comparison of the clinical efficacy in the 2 groups of patients with UACS.

Clinical efficacy	Experimental group (n=30), n (%)	Placebo group (n=28), n (%)	Difference (95% CI)	P value
Completely recovered	1 (3.3)	0	3.3 (−9.0, 16.7)	0.330
Significantly effective	11 (36.7)	0	36.7 (17.6, 54.5)	<0.001
Effective	14 (46.7)	2 (7.1)	39.6 (16.9, 57.5)	<0.001
Total efficacy	26 (86.7)	2 (7.1)	79.6 (57.0, 89.1)	<0.001

UACS, upper airway cough syndrome.