Fig 1.
Overview of Single Case Experimental Design and Measurements.
Note: A1: baseline; B: Intervention; A2: follow-up; T0: premeasurement; T1: postmeasurement; T2: follow-up measurement; T3: 3-months follow-up measurement; D: daily questionnaires; I: semi-structured interviews.
Fig 2.
Recruitment and participation flow-chart.
Table 1.
Measures, instruments and moment of assessment.
Fig 3.
Screenshots of the Feelee app.
Note: The presented figures serve as illustrative examples and contain no authentic individual data, only pseudonymized information.
Table 2.
Demographic characteristics.
Table 3.
Effect sizes (Cohen’s d), p-values and number of significant cases from normal permutation test, and median individual TAU-U scores for each phase comparison.
Fig 4.
Boxplot for emotion regulation items for each phase.
Note. The soft grey background of ‘suppression’ indicates an anticipated decrease. For all other items, an increase was expected.
Table 4.
Changes in emotional differentiation across time points: Within-person SD scores and paired-sample t-test results for positive and negative affect.
Table 5.
Results of randomization test and significant Reliable Change Index (RCI) cases for secondary emotional outcomes.
Table 6.
Results of randomization test and significant Reliable Change Index (RCI) cases for secondary treatment outcomes.
Table 7.
Overview of statements from both adolescents and clinicians semi-structured interviews.