Feasibility of renal resistive index measurements performed by an intermediate and novice sonographer in a volunteer population

The Ultrasound Journal

Table 2 Comparison of RRI measurements between respective non-expert and expert examiners

	ICC (95% CI)	Mean difference (95% CI, p value)	LoA
(a) Total study population (n = 23)
RRI_total
INT:EXP	0.96 (0.90–0.98)	0.002 (− 0.005 to 0.009, 0.597)	− 0.031 to 0.035
NOV:EXP	0.85 (0.69–0.94)	0.002 (− 0.011 to 0.015, 0.752)	− 0.056 to 0.060
RRI_dx
INT:EXP	0.94 (0.87–0.98)	0.003 (− 0.006 to 0.011, 0.508)	− 0.035 to 0.040
NOV:EXP	0.86 (0.70–0.94)	0.002 (− 0.010 to 0.015, 0.701)	− 0.054 to 0.058
RRI_sin
INT:EXP	0.94 (0.87–0.98)	0.001 (− 0.007 to 0.010, 0.729)	− 0.037 to 0.040
NOV:EXP	0.79 (0.57–0.91)	0.002 (− 0.014 to 0.017, 0.836)	− 0.070 to 0.073
(b) Study population after excluding first five volunteers (n = 18)
RRI_total
INT:EXP	0.97 (0.92–0.99)	0.004 (− 0.004 to 0.012, 0.287)	− 0.026 to 0.034
NOV:EXP	0.90 (0.75–0.96)	0.008 (− 0.005 to 0.020, 0.223)	− 0.042 to 0.058

RRI renal resistive index, n number, ICC intraclass correlation coefficient, CI confidence interval, LoA 95% limits of agreement, INT:EXP comparison of intermediate and expert examiners, NOV:EXP comparison of novice and expert examiners