Frequencies and percentages were calculated for categorical variables as sex, type of surgery, and side effects; and means with their respective standard deviations were calculated for continuous variables like age and cumulative dose of epidural opioids.
Se obtuvieron frecuencias y porcentajes para variables categóricas, como sexo, tipo de cirugía y efectos adversos; se usaron medias y su respectiva desviación estándar para variables continuas, como edad y dosis acumulativa de opioide epidural.