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

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

 ICC (95% CI)Mean difference (95% CI, p value)LoA
(a) Total study population (n = 23)
 RRItotal
  INT:EXP0.96 (0.90–0.98)0.002 (− 0.005 to 0.009, 0.597)− 0.031 to 0.035
  NOV:EXP0.85 (0.69–0.94)0.002 (− 0.011 to 0.015, 0.752)− 0.056 to 0.060
 RRIdx
  INT:EXP0.94 (0.87–0.98)0.003 (− 0.006 to 0.011, 0.508)− 0.035 to 0.040
  NOV:EXP0.86 (0.70–0.94)0.002 (− 0.010 to 0.015, 0.701)− 0.054 to 0.058
 RRIsin
  INT:EXP0.94 (0.87–0.98)0.001 (− 0.007 to 0.010, 0.729)− 0.037 to 0.040
  NOV:EXP0.79 (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)
 RRItotal
  INT:EXP0.97 (0.92–0.99)0.004 (− 0.004 to 0.012, 0.287)− 0.026 to 0.034
  NOV:EXP0.90 (0.75–0.96)0.008 (− 0.005 to 0.020, 0.223)− 0.042 to 0.058
  1. 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