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Table 4 Observed and predicted frequencies of RAS ≥ 50% using the scoring system

From: A prediction model for renal artery stenosis using carotid ultrasonography measurements in patients undergoing coronary angiography

  

Without RAS ≥50%

With RAS ≥50%

Score

Numbers of patients (n)

Observed frequency (n)

Predicted frequency (n)

Observed frequency (n)

Predicted frequency* (n)

0

156

155

155.12

1

0.88

1

145

144

144.17

1

1.83

2

106

104

103.01

2

2.99

3

77

71

72.26

6

4.74

4

56

48

48.75

8

7.24

5

45

34

33.68

11

11.32

6

28

14

15.90

14

12.10

7

21

9

7.71

12

13.29

8

7

2

1.43

5

5.57

9

0

0

0

0

0

10

0

0

0

0

0

11

0

0

0

0

0

  1. *(Number of patients) × 1/[1 + Exp(-L)], when L = -5.175 + 0.817 × (score).
  2. p = 0.881, Hosmer-Lemeshow test.
  3. Coefficient of determination R 2 = 0.957 for agreement with the observed frequency, Levenburg-Marquardt non-linear regression method.