Table 4.

Intraclass correlation coefficients (ICC) and within-subject coefficients of variation (wCV) of the shear wave speed (SWS) obtained from a single acquisition (N = 1) and of the median SWS obtained from multiple repeated intra-sonographer acquisitions (N = 2, 3,…, 10).

# Acquisitions (N)	ICC(1,1) (95% CI)	ICC(1,2) (95% CI)	wCV (%)	# Participants
1	0.40 (0.17, 0.59)	0.57 (0.29, 0.74)	43.0	61
2	0.48 (0.27, 0.65)	0.65 (0.42, 0.79)	34.9	61
3	0.42 (0.19, 0.61)	0.59 (0.32, 0.76)	39.9	61
4	0.67 (0.50, 0.79)	0.80 (0.67, 0.88)	26.7	57
5	0.67 (0.50, 0.80)	0.81 (0.67, 0.89)	24.1	55
6	0.62 (0.42, 0.76)	0.76 (0.59, 0.86)	23.1	51
7	0.63 (0.42, 0.77)	0.77 (0.59, 0.87)	23.1	47
8	0.67 (0.47, 0.80)	0.80 (0.64, 0.89)	21.8	44
9	0.67 (0.45, 0.81)	0.80 (0.62, 0.90)	22.8	38
10	0.72 (0.48, 0.86)	0.84 (0.65, 0.92)	22.0	28

ICC(1,1) was calculated using the ‘irr’ package in R based on a single-unit, absolute-agreement, one-way random effect analysis of variance (ANOVA) model. ICC(1,2) was calculated using the same package based on an average-unit (i.e., average of two sonographers as the assessment basis), absolute-agreement, one-way random effect ANOVA model.

CI confidence interval, ICC intraclass correlation coefficient, wCV within-subject coefficient of variation