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Difference between pre- and postinjection epidural pressure values (ΔP) in dogs receiving only acepromazine in premedication (group A) and dogs receiving a combination of acepromazine and methadone (group AM). The box and the line represent the interquartile range and the median, respectively; the whiskers indicate minimum and maximum. The difference in ΔP between the two groups is statistically significant (P = 0.03).
