Table 2:

Summary of the results of MR imaging interpretation by 3 observers^{^a}

	Presence or Absence of T1-SP
	Observer 1		Observer 2		Observer 3		Overall^{^b}
	+	−	+	−	+	−	+	−
Sinonasal melanoma	22	9	26	5	20	11	23	8
Nonmelanomatous malignant sinonasal tumors	7	99	1	105	3	103	3	103

Note:—+ indicates presence; −, absence.
↵a Interobserver agreement between observers 1 and 2, κ = .69; between observers 1 and 3, κ = 0.72; between observers 2 and 3, κ = 0.71; average, κ = 0.71.
↵b Data were obtained by consensus interpretation of 3 observers.