| Study | Total N | Number of interventions | Approximate number of people per intervention group |
| TREC‐Rio‐II | 316 | 2 | 158 |
| TREC‐Rio‐I | 301 | 2 | 150 |
| TREC‐Vellore‐II | 300 | 2 | 150 |
| TREC‐Vellore‐I | 200 | 2 | 100 |
| Baldacara 2011 | 150 | 5 | 30 |
| Mantovani 2013 | 100 | 4 | 25 |
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