Table 2.
Studies using different data sources (N=33).
| Data source | Value, n (%) |
| Surveys | 20 (30.8) |
| Interviews | 8 (12.3) |
| Learning Management System | 18 (27.7) |
| Discussions | 5 (7.7) |
| Quizzes | 9 (13.8) |
| Other | 5 (7.7) |
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