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Table 6 Planned and true power of trials

From: A reinvestigation of recruitment to randomised, controlled, multicenter trials: a review of trials funded by two UK funding agencies

  Planned power
80%to 89% 90%+ Missing
  N n (%) N n (%) N
True power 39   28   6
90%+   2 (7)   10 (53)  
80% to 89%   12 (43)   4 (21)  
<80%   14 (50)   5 (26)  
Missing   11   9  
Final recruitment 39   28   6
≥100%   22 (56)   16 (57)  
≥80% but less than 100%   6 (15)   9 (32)  
<80%   11 (28)   3 (11)