Table 5. The P values of pairwise comparisons for the differences in coughing scores as assessed by the researchers by the Mann—Whitney U test.

(Z values in the parenthesis).

Parameters	IFN Injection vs Control	IFN Injection vs IFN Nebulization 1	IFN Injection vs IFN Nebulization 2	Control vs IFN Nebulization 1	Control vs IFN Nebulization 2	IFN Nebulization 1 vs IFN Nebulization 2
The differences of researchers’ coughing scores of days 1 and 3	0.018(-2.359)	0.382(-0.873)	0.248(-1.155)	0.126(-1.529)	<0.001(-3.636)	0.028(-2.192)
The differences of researchers’ coughing scores of days 3 and 5	0.004(-2.844)	0.955(-0.057)	0.811(-0.239)	0.003(-2.951)	0.009(-2.601)	0.811(-0.239)