. Author manuscript; available in PMC: 2021 Jul 1.

Published in final edited form as: J Allergy Clin Immunol Pract. 2020 May 4;8(7):2341–2350.e1. doi: 10.1016/j.jaip.2020.04.048

Table 5:

Reliability assessment of the CRS-PRO and SNOT-22 in both CRS with and without polyps subgroups.

	CRSsNP	CRSwNP

Cronbach’s alpha
CRS-PRO 21 item	0.91	0.88
CRS-PRO 12-Item	0.87	0.82
SNOT-22	0.93	0.94

Test-Retest Correlation (Pearson’s Correlation)
CRS-PRO 21 item	0.83^**	0.82^**
CRS-PRO 12-Item	0.80^**	0.83^**
SNOT-22	0.75^**	0.91^**

ICC
CRS-PRO 21 item	0.90 (F=10.5, p<0.0005)	0.88 (F=10.54 P0.0005)
CRS-PRO 12-Item	0.88 (F=8.94 P<0.0005)	0.88 (F=9.8 P0.0005)
SNOT-22	0.85 (F=6.75 P<0.0005)	0.96 ( F=21.3 P0.0005)

p<0.05

^**

p<0.01.

Cronbach’s coefficient alpha evaluates internal consistency reliability. A Cronbach alpha >0.70 is considered to be adequate.

ICC- intra-class correlation coefficient, an ICC greater than 0.75 is considered good, greater than 0.90 is considered excellent.