## 3 Results and Discussion
### Statistical Analysis of Discarded Materials Management  
The proposed approach began with a statistical analysis that provided insight into the most suitable frequency of DiMaL collection and the types of materials that might have been more promising, based on their generation quantities and periodicity. Table 3 shows the results of the ANOVA applied to the collection periods of the quantities in Artilab. The type of DiMaL significantly affected the amount collected. However, the collection time or period did not result in a statistically significant change in the amount collected. This suggests that the designated collection period may not be significant, whereas the type of collected material is. Additionally, Table 4 presents the results obtained from the pairwise comparisons using Tukey's Test. This analysis provides information on the relative significance of different DiMaL types based on the collected amounts of each type. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Difference** & **Lower Bound** & **Upper Bound** & **Adjusted \(p\)-Value** \\ \hline HD-lining (SIGNIFICANT) & 63.84 & 43.47 & 84.22 & \(1.0\times 10^{-7}\) \\ \hline Canva-lining & 12.76 & \(-\)7.62 & 33.14 & \(3.3\times 10^{-1}\) \\ \hline PLUTONE- lining (SIGNIFICANT) & 20.72 & 0.34 & 41.09 & \(4.5\times 10^{-2}\) \\ \hline Canva-HD & \(-\)51.08 & \(-\)71.46 & \(-\)30.71 & \(3.8\times 10^{-6}\) \\ \hline PLUTONE-HD (SIGNIFICANT) & \(-\)43.13 & \(-\)63.51 & \(-\)22.75 & \(4.1\times 10^{-5}\) \\ \hline PLUTONE-Canva & 7.96 & \(-\)12.42 & 28.33 & \(7.0\times 10^{-1}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Statistical analysis results using [PERSON]’s test. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Leather** & **Booster** & **Lining** & **Canva** \\ \hline Artilab (Ar) & \multirow{3}{*}{Cow leather with chrome tanning (smooth and grain)} & \multirow{3}{*}{Lyliane} & Doublure microfibre} & \multirow{3}{*}{Canva A} \\ \cline{3-3} \cline{5-5}  
The results are conclusive and emphasize the significance of collecting HD and Plutone leathers, as well as Canva, compared to lining in the Artilab company. This is in line with the historical trend shown by the material collection throughout the study, as shown in Figures 5 and 6. If we consider the entire study period (2022 and 2023), an average of 6227.10 kg/month (\(\pm\)10.22%) of DiMaL was collected. Figure 6 shows the prevalence of HD leather over other DiMaL, with a maximum collection in 2022 of 322.9 and a minimum of 301.9 kg/month, and in 2023, a maximum of 338.7 and a minimum of 138.3 kg/month. Over the entire study (22-23), it reaches an average value of 251.8 kg/month. The second most generated DiMaL was Plutone. In 2022, it reached a maximum of 161.7 and a minimum of 118.1 kg/month. In 2023, it reached a maximum of 114.3 and a minimum of 91.9 kg/month. In the overall study, it had an average value of 111.9 kg/month. As for the other two DiMaLs, Canva and Lining, they were less frequent, with average quantities in the study set of 101.3 and 60.8 kg/month, respectively. In the months considered, as shown in Figure 6, Plutone leather accounted for around 48.1%, while Canva accounted for 11.3%,  
Figure 5: Monthly collection data of DiMaL represented in a box plot during the study period from 2022 to 2023, illustrating the variation and distribution over time. Figure 6: Average percentage of processed and selected discarded material for detailed study (**a**), along with the percentage distribution of the studied DiMaL for assessing alternative management options (**b**), in the study period. for 18.6% and Lining for 11.3%. If we add the two types of leather (HD + Plutone), they reach 70.1% of the total studied; as was predictable, it was the most strategic TG in terms of quantity. Conversely, the obtained data were cross-referenced with the authorized waste manager responsible for handling the transfer from the selected company (Artilab) to the final landfill in the area.