Once it had been determined which independent variables were associated with the presence of mortality, a binomial logistical regression model was constructed by entering the “main” type of anaesthesia explanatory variable and all the rest which had been seen to have been associated with mortality <0.20 statistical significance or biological explanation.
Una vez se determinó cuáles variables independientes estaban asociadas a la presencia de mortalidad, se construyó un modelo de regresión logística binomial, ingresando la variable explicativa "principal" tipo de anestesia y todas la demás que hubieran resultado asociadas a la mortalidad, con significación estadística menor de 0,20 o explicación biológica.