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Table 3 Intraobserver and interobserver agreement

From: Reliability of point-of-care ultrasound to evaluate fluid tolerance performed by critical care residents

 

Intraobserver 1

Intraobserver 2

Intraobserver 3

Interobserver

VTI variables

        

Variability, ICC (CI95%)

0.04 (− 0.31 to 0.39)

0.405

0.18 (− 0.21 to 0.50)

0.180

0.08 (− 0.27 to 0.42)

0.327

− 0.02 (− 0.20 to 0.22)

0.574

Variability > 15%, AC1 (CI95%)

0.38 (0.01–0.75)

0.044

0.53 (0.20–0.86)

 < 0.003

0.01 (− 0.38 to 0.38)

0.995

0.21 (− 0.05 to 0.47)

0.114

Non-responder, % of agreement (CI95%)

0.58 (0.39–0.77)

 < 0.001

0.70 (0.52–0.88)

 < 0.001

0.50 (0.34–0.73)

 < 0.001

0.56 (0.43–0.69)

 < 0.001

IVC variables

        

Distensibility index, ICC (CI95%)

0.08 (− 0.28 to 0.41)

0.338

0.18 (− 0.16 to 0.49)

0.148

0.21 (− 0.13 to 0.51)

0.115

0.13 (− 0.07 to 0.37)

0.105

Distensibility > 18%, AC1 (CI95%)

0.41 (0.07–0.76)

0.021

− 0.04 (− 0.42 to 0.34)

0.845

0.41 (0.06–0.76)

0.021

0.19 (− 0.07 to 0.44)

0.144

Non-responder, % of agreement (CI95%)

0.69 (0.52–0.86)

 < 0.001

0.45 (0.29–0.65)

 < 0.001

0.69 (0.52–0.86)

 < 0.001

0.56 (0.45–0.68)

 < 0.001

IJV variables

        

Distensibility index, ICC (CI95%)

0.10 (− 0.34 to 0.35)

0.481

0.35 (− 0.01 to 0.62)

0.027

0.15 (− 0.21 to 0.47)

0.207

− 0.01 (− 0.17 to 0.23)

0.488

Distensibility > 18%, AC1 (CI95%)

0.45 (0.11–0.80)

0.012

0.85 (0.69–1.00)

 < 0.001

0.29 (− 0.07 to 0.66)

0.113

0.54 (0.29–0.80)

 < 0.001

Non-responder, % of agreement (CI95%)

0.69 (0.52–0.86)

 < 0.001

0.88 (0.75–0.99)

 < 0.001

0.63 (0.45–0.80)

 < 0.001

0.71 (0.59–0.83)

 < 0.001

VExUS variables

        

IVC ≥ 2 cm, AC1 (CI95%)

0.58 (0.28–0.88)

 < 0.001

0.69 (0.42–0.95)

 < 0.001

0.63 (0.34–0.91)

 < 0.001

0.38 (0.13–0.62)

0.004

Hepatic pattern, AC1 (CI95%)

0.88 (0.75–1.00)

 < 0.001

0.92 (0.81–1.00)

 < 0.001

0.71 (0.51–0.92)

 < 0.001

0.51 (0.32–0.69)

 < 0.001

Portal pattern, AC1 (CI95%)

0.62 (0.39–0.85)

 < 0.001

0.33 (0.06–0.60)

0.017

0.32 (0.05–0.59)

0.022

0.26 (0.06–0.45)

0.010

Renal pattern, AC1 (CI95%)

0.87 (0.73–1.00)

 < 0.001

0.77 (0.53–0.99)

 < 0.001

0.83 (0.67–0.99)

 < 0.001

0.53 (0.36–0.70)

 < 0.000

VExUS grade, AC1 (CI95%)

0.71 (0.50–0.91)

 < 0.001

0.62 (0.40–0.83)

 < 0.001

0.74 (0.54–0.94)

 < 0.001

0.52 (0.34–0.69)

 < 0.001

VExUS, % of agreement (CI95%)

0.78 (0.63–0.93)

 < 0.001

0.69 (0.52–0.86)

 < 0.001

0.81 (0.67–0.96)

 < 0.001

0.65 (0.52–0.77)

 < 0.001

  1. VTI velocity–time integral, ICC intraclass correlation coefficient, AC1 first-order agreement coefficient, CI confidence interval, IVC inferior vena cava, IJV internal jugular vein, VExUS venous excess ultrasound