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Types of AR triggers used in the empirical articles
| Trigger type | Number of studies | (%) |
|---|---|---|
| Location-based | 22 | 37.3 |
| Markerless | 13 | 22.0 |
| Marker-based | 7 | 11.9 |
| Spatial marking | 4 | 6.8 |
| Combination of marker-based and location-based | 3 | 5.1 |
| Combination of markerless and location-based | 1 | 1.7 |
| Not mentioned | 9 | 15.3 |
| Total | 59 | 100.0 |
