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Table 1 Type I (alpha) and type II (beta) error [6].

From: Critical appraisal of meta-analyses: an introductory guide for the practicing surgeon

   Truth in the overall patient population
   Treatment difference No treatment difference
Study results Treatment difference    A. Correct conclusion    B. Type I error (false-positive result)
  No treatment difference    C. Type II error (false-negative result)    D. Correct conclusion