Table 2.
Descriptive statistics of included studies based on study location and data extraction dimensions
| Parameters | Category | Count | Percentage |
|---|---|---|---|
| Location | Multinational | 10 | 17% |
| Iran | 7 | 12% | |
| USA | 8 | 14% | |
| China | 6 | 10% | |
| Israel | 4 | 7% | |
| Australia | 4 | 7% | |
| India | 4 | 7% | |
| Algeria | 3 | 5% | |
| Germany | 3 | 5% | |
| South Korea | 1 | 2% | |
| Thailand | 1 | 2% | |
| Indonesia | 1 | 2% | |
| Greece | 1 | 2% | |
| Switzerland | 1 | 2% | |
| Spain | 1 | 2% | |
| Colombia | 1 | 2% | |
| UK | 1 | 2% | |
| Austria | 1 | 2% | |
| Input | Single document (SD) | 39 | 67% |
| Multiple documents (MD) | 18 | 31% | |
| Single and Multiple documents (SD and MD) | 1 | 2% | |
| Monolingual (Mono) | 58 | 100% | |
| Multilingual (Multi) | 0 | 0% | |
| Full Text (FT) | 47 | 81% | |
| Abstract (Ab) | 10 | 17% | |
| Full Text and Abstract (FT and Ab) | 1 | 2% | |
| Biomedical Research Literature (Lit) | 40 | 69% | |
| Electronic Health Record (EHR) | 11 | 19% | |
| Other biomedical related documents | 7 | 12% | |
| Purpose | To facilitate clinical decision-making | 17 | 29% |
| To facilitate biomedical research | 34 | 59% | |
| To facilitate patient health information seeking | 5 | 9% | |
| To facilitate patient health information seeking/To facilitate clinical decision-making | 1 | 2% | |
| To facilitate biomedical research/To support clinical decision-making | 1 | 2% | |
| User-oriented (U) | 16 | 28% | |
| Generic (G) | 42 | 72% | |
| Output | Informative | 56 | 97% |
| Informative and indicative | 2 | 3% | |
| Extractive (Ext) | 47 | 81% | |
| Abstractive (Abs) | 10 | 17% | |
| Extractive and Abstractive (Ext and Abs) | 1 | 2% | |
| Method | Machine Learning (ML) | 4 | 7% |
| Statistical and Computational Linguistics (Stats and CL) | 22 | 38% | |
| Computational Linguistics (CL) | 1 | 2% | |
| Machine Learning and Statistical (ML and Stats) | 1 | 2% | |
| Computational Linguistics and Machine learning (CL and ML) | 4 | 7% | |
| Statistical, machine learning and Computational Linguistics (Stats, ML and CL) | 26 | 45% | |
| Evaluation | Intrinsic (I) | 51 | 88% |
| Extrinsic (E) | 3 | 5% | |
| Intrinsic and Extrinsic (I and E) | 4 | 7% | |
| Quantitative Evaluation (Quan) | 38 | 66% | |
| Qualitative Evaluation (Qual) | 2 | 3% | |
| Quantitative and Qualitative Evaluation (Quan and Qual) | 18 | 31% | |
| Data and Code | Data Publicly Available | 48 | 83% |
| Data Partially Available | 2 | 3% | |
| Data not Publicly Available | 6 | 10% | |
| Data Details not Mentioned | 2 | 3% | |
| Source Code or Application Available | 8 | 14% | |
| Source Code or Application not Available | 51 | 88% |