Logistic regression and power of the study

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Logistic regression and power of the study

iheb bougmiza
Hello every body
  I have 40 patients divided in 2 groups, 25 patients with preventable adverse events (AE) and 15 with non preventable AE.
  I want to study the relationship between the evitability caracter of AE and the caracteristics of these patients.
  I did a logistic regression, my problem is the power (puissance à posteriori ) of the study. I suppose it'll be very low because of my low sample size
  How can I calculate it in SPSS ? which parameters I need ?
  Thanks in advance

  NB: Excuse my english (I try to improve it)



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