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Table 4 Sample size calculation for LV longitudinal, circumferential and radial strain to detect 5, 8 and 10% relative change with 90% power and α error of 0.05

From: Cardiovascular magnetic resonance feature tracking in small animals – a preliminary study on reproducibility and sample size calculation

Parameter

Mean difference ± SD

Sample size (n)

5%

8%

10%

EllLAX (%)

−0.98 ± 7.96

53

21

13

EccSAX (%)

−3.46 ± 6.84

39

15

10

ErrSAX (%)

3.48 ± 10.06

85

33

21

  1. Abbreviations as in Table 2