Table 3.
Description of the online questionnaire.
| Questionnaires | Nature of Collected Data | Nb Items | Scale | Justification | Cronbach’s Alpha |
|---|---|---|---|---|---|
| Personal data | Age, gender | 2 | - | Double-checking of t1 and t2 data pairing | |
| Multi-dimensional Psychological Flexibility Inventory [63] | Psychological flexibility | 24 | 1–6 | Measuring one of the mechanisms of action of mindfulness based interventions on mental health and potentially time management change | 0.84 |
| DASS-21 [64] | Depression, anxiety, and stress | 21 | 0–3 | Measuring mental health | 0.82, 0.71 and 0.75 |
| Warwick–Edinburgh-Mental Well-Being Scale [65] | Subjective and psychological well-being | 14 | 1–5 | Measuring well-being | 0.87 |
| Optimal Time Use Inventory * [66] | Time management (self-congruent time, control over one’s time, balance of activities, efficient time, optimal time use index) | 25 | 1–5 | Measuring the different facets of time management | 0.82 |