Table 2. Non-inferiority test of the difference of pharyngeal observable sites (based on a type I error rate of 0.025 [one-sided test], a statistical power of 90 %, and a non-inferiority threshold [Δ] of 0.1).

Spray group (95 % CI)	Combination group (95 % CI)	Difference (95 % CI)	P value
8.33 (7.94~8.72)	8.77 (8.49~9.05)	–0.44 (–0.84~–0.03)	0.01