Table 1.

Interobserver agreement parameters based on baseline T1-weighted, contrast-enhanced images (CE T1-WI) and T2-weighted images in 68 patients.

Baseline	Two-dimensional measurements on CE T1-WI (mm)			Volume measurements on CE T1-WI (cm3)
	CC	AP	ML	VOL
Reader A, mean (SD)	8.40 (4.60)	8.70 (4.90)	12.70 (5.70)	0.85 (1.74)
A (n = 29)	5.00	5.06	8.32	0.13
B (n = 27)	9.05	9.71	14.28	0.63
C (n = 6)	12.58	12.23	18.12	1.29
D (n = 6)	17.50	18.33	21.62	4.71
Reader B, mean (SD)	8.20 (4.80)	8.60 (5.10)	13.20 (5.70)	0.81 (1.69)
A (n = 29)	4.59	5.03	8.58	0.13
B (n = 27)	9.27	9.86	15.06	0.63
C (n = 6)	11.53	13.10	18.28	1.06
D (n = 6)	18.33	18.93	22.28	4.57
Meandiff (SDdiff)	0.12 (1.53)	-0.18 (1.14)	-0.48 (1.08)	0.01 (0.055)
Baseline	Two-dimensional measurements on T2-WI (mm)			Volume measurements on T2-WI (cm3)
	CC	AP	ML	VOL
Reader A, mean (SD) (n = 68)	7.60 (4.5)	8.20 (5.00)	11.90 (5.50)	0.72 (1.49)
Reader B, mean (SD) (n = 68)	7.20 (4.00)	8.40 (4.90)	12.10 (5.00)	0.72 (1.50)
Meandiff (SDdiff)	0.35 (1.41)	−0.18 (1.37)	−0.21 (1.69)	0.07 (0.069)

The rows of reader A and B of each imaging modality present the means and standard deviations of the measurements assessed by these readers. The means and standard deviations are also subdivided according to vestibular schwannoma stage for CE T1-WI. The mean difference row presents the mean differences between the measurements of reader A and B and the SD of these differences

A intracanalicular, B extracanalicular, C compressing brain stem, D deviating fourth ventricle, SD standard deviation, CC craniocaudal dimension, AP anteroposterior dimension, ML mediolateral dimension, VOL volume, Mean_diff mean of the observer difference, SD_diff standard deviation of the differences between observer A and B, CE T1-WI contrast enhanced T1-weighted images, T2-WI T2-weighted images