**5. Results**

Background characteristics and smartphone use of both study groups are presented in Table 3. We asked participants "Do you expect that the PERGAMON platform will support you in your diabetes management?". Of the 21 participants in the pre-pilot and the pilot groups 7 (33.33%) answered positively; 1 (4.76%) answered negatively, and 13 (61.90%) said they did not know.


**Table 3.** Socio-demographic characteristics and smartphone use in both study groups (*N* = 21).

In total, 71 adolescents with T1D were approached to take part in the pilot study, of which 30 patients met the inclusion criteria and indicated their interest to participate in the pilot study. Sixteen participants (7 males/9 females) withdrew their consent because of delayed study start date (13%), time constraints due to school activities (56%), time constraints due to activities outside school hours (13%), low motivation to participate (6%), low expectations regarding the game format (6%) and worries about their diabetes condition (6%).

During the pre-pilot study there was one drop-out during the second hospital visit due to academic under achievement at school.
