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Numbers of publications by type of artificial intelligence (AI) system and research setting (N=292).
| Type of AI system | Basic or experimental (n=243), n (%) | Real-world setting (n=34), n (%) | Other (n=15), n (%) | Total (n=292), n (%) |
| Machine learning | 197 (81.1) | 24 (70.6) | 7 (46.7) | 228 (78.1) |
| Expert system | 29 (11.9) | 4 (11.8) | 1 (6.7) | 34 (11.6) |
| Not specified | 12 (4.9) | 6 (17.6) | 7 (46.7) | 25 (8.6) |
| Hybrid system | 5 (2.1) | 0 (0) | 0 (0) | 5 (1.7) |
