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Table 8 Sample size estimates for myocardial perfusion by CMR.

From: Reproducibility of adenosine stress cardiovascular magnetic resonance in multi-vessel symptomatic coronary artery disease

Patient Group SD* Sample Size
All subjects   
   2 segment change in number of ischemic segments 0.88 12
   0.10 change in transmural ischemia index 0.10 46
   0.20 change in myocardial perfusion reserve index 0.26 74
Low risk coronary artery disease - Control   
   2 segment change in number of ischemic segments 0.57 8
   0.10 change in transmural ischemia index 0.11 54
   0.20 change in myocardial perfusion reserve index 0.28 86
Coronary artery disease - Case   
   2 segment change in number of ischemic segments 1.14 16
   0.10 change in transmural ischemia index 0.09 38
   0.20 change in myocardial perfusion reserve index 0.22 54
  1. *Standard deviation of differences between first and second study.
  2. Sample size estimates for a two treatment parallel trial design.