Intraneural lidocaine ¹⁴C concentration over time. Intraneural lidocaine ¹⁴C concentration box plot given as median (log) (interquartile range, 25 to 75 percentile) values: diabetic mellitus (DM) versus control (Contr; n = 10 measurements per time point). Asterisks indicate adjusted significant difference between CTRL and DM, and a dot signifies a data outlier, defined as a data point that is located outside 1.5 times the interquartile range above the upper quartile and below the lower quartile. DPM = disintegrations/min.