Figure 1

Distribution of the residual quantity of methadone for each methadone dosage (5-, 10-, 20-, 40- and 60-mg bottles). Mean ± SD (ANOVA: F (4 df) = 21; p < 0.001).
Distribution of the residual quantity of methadone for each methadone dosage (5-, 10-, 20-, 40- and 60-mg bottles). Mean ± SD (ANOVA: F (4 df) = 21; p < 0.001).