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Coding results for sample studies.
| Region | Sample size | Empirical research | |||||
|---|---|---|---|---|---|---|---|
| Experimental research | Quantitative research | Qualitative research | Mixed research | Investigation research | Design-based research | ||
| Asia | 6 | 4 | 1 | 0 | 1 | 0 | 0 |
| Europe | 19 | 11 | 1 | 1 | 2 | 2 | 2 |
| America | 24 | 12 | 3 | 2 | 5 | 1 | 1 |
| Oceania | 9 | 2 | 0 | 3 | 2 | 1 | 1 |
| Africa | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| total | 59 | 30 | 5 | 6 | 10 | 4 | 4 |
