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Unit types, number of papers by type, and sample size means and ranges.
| Unit type | Papers (n=93), n (%) | Sample size, mean | Sample size, range |
| Clinical notes or reports | 34 (37) | 709 | 17-5098 |
| Abstracts or papers | 21 (23) | 1966 | 20-7000 |
| Sentences | 21 (23) | 26,678 | 100-360,938 |
| Other | 9 (10) | 5979 | 47-25,678 |
| Entities | 5 (5) | 15,957 | 100-39,876 |
| Tokens | 3 (3) | 42,121 | 1840-79,401 |
