LibraryPirate

452 CHAPTER 9 SIMPLE LINEAR REGRESSION AND CORRELATION
Age (Years) Bilirubin (mg/dl) Age (Years) Bilirubin (mg/dl)
42 1.0 52 3.5
58 5.2 58 5.6
52 5.1 45 1.9
Source: Geri R. Brown, M.D. Used with permission.
9.7.2 Another variable of interest in the study by Reiss et al. (A-3) (see Exercise 9.3.4) was partial
thromboplastin (aPTT), the standard test used to monitor heparin anticoagulation. Use the data in
the following table to examine the correlation between aPTT levels as measured by the
CoaguCheck point-of-care assay and standard laboratory hospital assay in 90 subjects receiving
heparin alone, heparin with warfarin, and warfarin and exoenoxaparin.
Warfarin and
Heparin Warfarin Exoenoxaparin
CoaguCheck Hospital CoaguCheck Hospital CoaguCheck Hospital
aPTT aPTT aPTT aPTT aPTT aPTT
49.3 71.4 18.0 77.0 56.5 46.5
57.9 86.4 31.2 62.2 50.7 34.9
59.0 75.6 58.7 53.2 37.3 28.0
77.3 54.5 75.2 53.0 64.8 52.3
42.3 57.7 18.0 45.7 41.2 37.5
44.3 59.5 82.6 81.1 90.1 47.1
90.0 77.2 29.6 40.9 23.1 27.1
55.4 63.3 82.9 75.4 53.2 40.6
20.3 27.6 58.7 55.7 27.3 37.8
28.7 52.6 64.8 54.0 67.5 50.4
64.3 101.6 37.9 79.4 33.6 34.2
90.4 89.4 81.2 62.5 45.1 34.8
64.3 66.2 18.0 36.5 56.2 44.2
89.8 69.8 38.8 32.8 26.0 28.2
74.7 91.3 95.4 68.9 67.8 46.3
150.0 118.8 53.7 71.3 40.7 41.0
32.4 30.9 128.3 111.1 36.2 35.7
20.9 65.2 60.5 80.5 60.8 47.2
89.5 77.9 150.0 150.0 30.2 39.7
44.7 91.5 38.5 46.5 18.0 31.3
61.0 90.5 58.9 89.1 55.6 53.0
36.4 33.6 112.8 66.7 18.0 27.4
52.9 88.0 26.7 29.5 18.0 35.7
57.5 69.9 49.7 47.8 78.3 62.0
39.1 41.0 85.6 63.3 75.3 36.7
74.8 81.7 68.8 43.5 73.2 85.3
32.5 33.3 18.0 54.0 42.0 38.3
125.7 142.9 92.6 100.5 49.3 39.8
77.1 98.2 46.2 52.4 22.8 42.3
143.8 108.3 60.5 93.7 35.8 36.0
Source: Curtis E. Haas, Pharm. D. Used with permission.