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Table 4: Atrophy and neuropathy of the olfactory bulb on MR images according to the Korean Version of the Sniffin' Sticks II test results and etiology^{^a}
Etiology Normosmia Hyposmia/Anosmia P Value^{^b}
Chronic rhinosinusitis (n = 15) 
    Atrophy 0/4 (0) 7/11 (63.6) .077
    Neuropathy 1/4 (25.5) 3/11 (27.3) 1.000
Postviral URI (n = 7) 
    Atrophy 1/3 (33.3) 3/4 (75.0) .486
    Neuropathy 2/3 (66.7) 1/4 (25.0) .486
Trauma (n = 2) 
    Atrophy 0/0 (0) 1/2 (50.0) NA
    Neuropathy 0/0 (0) 0/2 (0) NA
Idiopathic (n = 10) 
    Atrophy 0/3 (0) 6/7 (85.7) .033
    Neuropathy 1/3 (33.3) 1/7 (14.3) 1.000
Note:—NA indicates not available.
↵a Data are number of patients (%).
↵b Fisher exact test.

Etiology	Normosmia	Hyposmia/Anosmia	P Value^{^b}
Chronic rhinosinusitis (n = 15)
Atrophy	0/4 (0)	7/11 (63.6)	.077
Neuropathy	1/4 (25.5)	3/11 (27.3)	1.000
Postviral URI (n = 7)
Atrophy	1/3 (33.3)	3/4 (75.0)	.486
Neuropathy	2/3 (66.7)	1/4 (25.0)	.486
Trauma (n = 2)
Atrophy	0/0 (0)	1/2 (50.0)	NA
Neuropathy	0/0 (0)	0/2 (0)	NA
Idiopathic (n = 10)
Atrophy	0/3 (0)	6/7 (85.7)	.033
Neuropathy	1/3 (33.3)	1/7 (14.3)	1.000