Summary characteristics of included studies
| Description | No of studies |
| Therapeutic area of host RCT | |
| Cancer—prostate | 11 |
| Benign prostatic hyperplasia | 2 |
| Testosterone | 1 |
| Suicide | 1 |
| Cancer—various | 1 |
| Host RCT type | |
| Treatment | 10 |
| Prevention | 5 |
| Screening | 1 |
| Recruitment study design | |
| Quantitative descriptive | 10 |
| Randomised controlled trial | 3 |
| Before and after study | 2 |
| Non-randomised controlled study | 1 |
| No of study participants in recruitment study | |
| 0–999 | 6 |
| 1000–4999 | 5 |
| 5000–9999 | 2 |
| 10 000+ | 3 |
| TOTAL recruitment studies included | 16 |
RCT, randomised controlled trial.