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Table 4 Sample sizes

From: Quantification of atrial dynamics using cardiovascular magnetic resonance: inter-study reproducibility

  

Left atrium

Right atrium

  

5 %

10 %

15 %

20 %

5 %

10 %

15 %

20 %

Atrial function

Volumetric index (%)

        

Reservoir; global

EF Total

18

5

2

2

47

12

6

3

Conduit

EF Passive

135

34

15

9

162

41

18

11

Booster pump

EF Booster

391

98

44

25

317

80

36

20

 

Strain (%)

        

Reservoir

εs

27

7

4

2

231

58

26

15

Conduit

εe

57

15

7

4

359

90

40

23

Booster pump

εa

281

71

32

18

496

124

56

32

 

Strain Rate (s −1 )

        

Reservoir

SRs

57

15

7

4

484

121

54

31

Conduit

SRe

289

73

33

19

1085

272

121

68

Booster pump

SRa

435

109

49

28

869

218

97

55

 

Atrial volume (ml)

        
 

Maximum

39

10

5

3

129

33

15

9

 

Minimum

85

22

10

6

159

40

18

10

 

Prior to atrial contraction

89

23

10

6

147

37

17

10

  1. Presented are sample sizes required to detect a relative 5, 10, 15 or 20 % change in atrial functional parameters (with a 90 % power and an α error of 0.05).
  2. SD, standard deviation; CoV, coefficient of variation; ICC, intraclass correlation coefficient; CI, confidence interval.
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Journal of Cardiovascular Magnetic Resonance

ISSN: 1532-429X

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