Table 3 Categorization as per the Spencer logarithmic scale in tiers 2 and 3.

From: Simultaneous monitoring of the middle cerebral and basilar arteries to detect right-to-left shunts using transcranial Doppler by agitated saline administration

Tier 2 (R-MCA vs L-MCA)

Left (L)

Total

0

I

II

III

IV

V

Right (R)

0

22

48

0

0

0

0

70

I

46

106

8

0

0

0

160

II

0

13

53

2

0

0

68

III

0

0

4

32

2

0

38

IV

0

0

0

3

4

0

7

o

0

0

0

0

1

0

1

Total

68

167

65

37

7

0

344

  

Weighted Kappa index 0.808 (p < 0.001)

Tier 3 (iMCA vs BA)

BA

Total

0

I

II

III

IV

V

iMCA

0

78

18

0

0

0

0

96

I

17

104

1

0

0

0

122

II

0

2

39

1

0

0

42

III

0

0

2

37

0

0

39

IV

0

0

0

0

3

0

3

V

0

0

0

0

0

1

1

Total

95

124

42

38

3

1

303

  

Weighted Kappa index 0.809 (p < 0.001)

 
  1. L-MCA left middle cerebral artery, R-MCA right middle cerebral artery, iMCA index of middle cerebral artery, BA basilar artery.
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