Table 2. Cronbach’s alpha and Spearman's correlation results for each item.

SNOT-22 Item	Item description	Cronbach’s alpha		Spearman's correlation
		Test	Retest	Test	Retest
1	Need to blow nose	0.806	0.806	0.941	0.925
2	Nasal obstruction	0.805	0.805	0.912	0.867
3	Sneezing	0.801	0.805	0.857	0.834
4	Runny nose	0.805	0.804	0.843	0.886
5	Cough	0.804	0.804	0.958	0.962
6	Post nasal discharge	0.804	0.804	0.959	0.968
7	Thick nasal discharge	0.805	0.806	0.956	0.909
8	Ear fullness	0.809	0.809	0.963	0.960
9	Dizziness	0.806	0.806	0.935	0.949
10	Ear pain	0.805	0.805	0.920	0.905
11	Facial pain/pressure	0.797	0.799	0.936	0.885
12	Loss of smell or taste	0.804	0.803	0.867	0.866
13	Difficulty falling asleep	0.800	0.801	0.949	0.957
14	Waking up at night	0.802	0.801	0.965	0.955
15	Lack of a good night’s sleep	0.795	0.796	0.964	0.948
16	Waking up tired	0.794	0.794	0.966	0.952
17	Fatigue	0.807	0.805	0.853	0.851
18	Reduced productivity	0.798	0.799	0.988	0.975
19	Reduced concentration	0.798	0.797	0.942	0.883
20	Frustrated/restless/irritable	0.803	0.802	0.957	0.959
21	Sad	0.806	0.807	0.951	0.942
22	Embarrassed	0.806	0.805	0.981	0.985