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Table 3 Further linear correlations between the IVGTT and the glucose clamp.

From: A simple intravenous glucose tolerance test for assessment of insulin sensitivity

Y

X

Equation

Time

period

r2

25th-75th percentiles of prediction error

Mbw

Y = -2.5 + 45.4 X

75 min

0.64

-10%

+16%

  

Y = -8.6 + 51.5 X

40 min

0.64

-8%

+21%

  

Y = -13.8 + 54.9 X

30 min

0.64

-12%

+25%

 

Same equation, but using total insulin AUC

Y = -2.8 + 53.4 X

75 min

0.68

-10%

+9%

  

Y = -6.1 + 54.0 X

40 min

0.64

-8%

+13%

  

Y = -14.5 + 60.0 X

30 min

0.67

-8%

+20%

Mbw

Y = 206 - 49.0 X + 340 CL/V d

75 min

0.70

-11%

+16%

  

Y = 224 - 56.4 X + 480 CL/Vd

40 min

0.74

-10%

+20%

  

Y = 223 - 57.9 X + 580 CL/V d

30 min

0.70

-10%

+23%

 

Same equation, but using total insulin AUC

Y = 265 - 63.6 X + 383 CL/V d

75 min

0.83

-9%

+11%

  

Y = 262 - 65.4 X + 488 CL/V d

40 min

0.82

-10%

+11%

  

Y = 260 - 67.1 X + 602 CL/V d

30 min

0.79

-8%

+14%

Mbw

Y = -99 + 54.0 X

75 min

0.63

-10%

+16%

  

Y = -9 + 51.5 X

10-40 min

0.64

-8%

+21%

  

Y = -14 + 54.9 X

10-30 min

0.64

-12%

+26%

  1. Vd, CL = volume of distribution and clearance of glucose for the IVGTT (units: L and L min-1, respectively).
  2. Insmean,= mean value plasma of insulin (units: pmol L-1)
  3. AUC ins = area under the curve for plasma insulin over time (unit: pmol min L-1)