## 4 Results
### Quantitative Data Analysis
#### 4.2.2 Use of the \"Object Return\" Option  
The second parameter in the analysis is the use of the object return option in the tasks, and the number of times when participants used this option is shown in Table 7.  
If we analyze the number of objects returned at the first level per sublevel in relation to the size of the object the participants were trying to reach, we find a significant correlation between these two parameters. For example, the number of objects returned on the basic sublevel was significant (73), and this option was used by 66.04% of the participants, while on the sublevel with enlarged objects, no subject used this option. However, further analysis of the data revealed that this result was due to difficulties in accurately grasping the 3D object. This is reflected in the increased number of incorrectly inserted objects, suggesting that the tasks were completed with less precision due to difficulties in handling larger 3D objects relative to the size of the hand. The sublevel with the shrunken objects has the highest number of objects returned (100). This indicates that the precision and handling of small 3D objects were a challenge for the participants. At the reduced contrast sublevel, a total of 51 objects were returned, and this option was used by 47.17% of participants.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Level** & **Sublevel** & **N** & **M** & **P** \\ \hline \multirow{4}{*}{1} & Basic & 73 & 8 & 35 (66.04\%) \\  & Enlarged objects & 0 & 0 & 0 (0.00\%) \\  & Shrunken objects & 100 & 11 & 32 (60.38\%) \\  & Reduced contrast & 51 & 6 & 25 (47.17\%) \\ \hline \multirow{4}{*}{2} & Without distractors & 56 & 6 & 22 (41.51\%) \\  & With distractors & 111 & 10 & 34 (64.15\%) \\ \hline \multirow{4}{*}{3} & Direct interaction & 24 & 4 & 15 (28.30\%) \\  & Indirect interaction & Not applicable for this sublevel \\ \hline \hline \end{tabular} N = total number of uses of the object return option; M = maximum number of object returns per participant; P = number (%) of participants who used return object option.  
\end{table}
Table 7: Number of times when option to return the object to the scene was used.  
On the second level, there is a significant difference in the use of the return object option between the sublevels, as participants used this option almost twice as often on the distractor sublevel. This can be explained by the presence of 3D distractor elements, which made the task considerably more difficult. If we look at the percentage of participants who successfully solved this task on the first attempt, we assume that the threshold used to determine the achieved size equality of the objects was well chosen considering the details of the task they were asked to solve (58.49% of participants at the sublevel without distractors and 35.85% of participants at the sublevel with distractors solved this task on the first attempt).  
On the third level, on the sublevel with direct interaction, a lower number of uses of the object return option were recorded compared to the previous levels. The return option was used a total of 24 times, with each participant returning an object a maximum of 4 times, and 28.30% used this option. This result indicates a relatively high level of success and adaptability of participants in solving this task, which means that participants were able to manage the combination of interactions effectively.  
In the indirect interaction sublevel, this option is not applicable. The reason for this is the nature of indirect interaction using a slider, which is designed so that it cannot go beyond the reach of the participant's virtual hand, eliminating the need to return the 3D object.