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422 CHAPTER 9 SIMPLE LINEAR REGRESSION AND CORRELATION
platform and the GRF recorded (in newtons) during the stance phase. The following table contains
22 measurements of force expressed as the mean of five force measurements per dog when walking
and the mean of five force measurements per dog when trotting. Use the GRF value when
walking to predict the GRF value when trotting.
GRF-Walk GRF-Trot GRF-Walk GRF-Trot
31.5 50.8 24.9 30.2
33.3 43.2 33.6 46.3
32.3 44.8 30.7 41.8
28.8 39.5 27.2 32.4
38.3 44.0 44.0 65.8
36.9 60.1 28.2 32.2
14.6 11.1 24.3 29.5
27.0 32.3 31.6 38.7
32.8 41.3 29.9 42.0
27.4 38.2 34.3 37.6
31.5 50.8 24.9 30.2
Source: Richard Evans, Ph.D. Used with permission.
9.3.7 Glomerular filtration rate (GFR) is the most important parameter of renal function assessed in renal
transplant recipients. Although inulin clearance is regarded as the gold standard measure of GFR,
its use in clinical practice is limited. Krieser et al. (A-6) examined the relationship between the
inverse of Cystatin C (a cationic basic protein measured in mg/L) and inulin GFR as measured by
technetium radionuclide labeled diethylenetriamine penta-acetic acid) (DTPA GFR) clearance
(ml/min/1.73 m 2 ). The results of 27 tests are shown in the following table. Use DTPA GFR as the
predictor of inverse Cystatin C.
DTPA GFR 1/Cystatin C DTPA GFR 1/Cystatin C
18 0.213 42 0.485
21 0.265 42 0.427
21 0.446 43 0.562
23 0.203 43 0.463
27 0.369 48 0.549
27 0.568 48 0.538
30 0.382 51 0.571
32 0.383 55 0.546
32 0.274 58 0.402
32 0.424 60 0.592
36 0.308 62 0.541
37 0.498 67 0.568
41 0.398 68 0.800
88 0.667
Source: David Krieser, M.D. Used with permission.