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Table 4 Sample Sizes per Group for differences of 5%, 10%, 15%, and 20% from placebo group mean estimated in the middle cerebral artery segment based on the inter-scan analysis

From: 3D whole-brain vessel wall cardiovascular magnetic resonance imaging: a study on the reliability in the quantification of intracranial vessel dimensions

 

Placebo group (mean ± SD)

Sample size

5%

10%

15%

20%

Lumen volume (mm3)

38.9 ± 8.9

329

83

38

22

Wall volume (mm3)

41.1 ± 7.6

215

55

25

15

Normalized wall index

0.52 ± 0.05

60

16

8

5

Mean wall thickness (mm)

0.63 ± 0.08

103

27

13

8

Maximum wall thickness (mm)

0.77 ± 0.1

107

28

13

8

  1. SD standard deviation