Table 1.
Registered trials using qualitative methods by registry
| WHO ICTRP | ClincalTrials.gov | ISRCTN | Overall | |
|---|---|---|---|---|
| Total trials in registry from 1999 to 2016 | 366,753 | 233,277 | 15,301 | 615,311 |
| Total identified with qualitative keyword | 144 | 1668 | 665 | 2477 |
| Total records excluded | 46 | 790 | 149 | 985 |
| Total confirmed with qualitative methods | 98 | 878 | 516 | 1492 |
| Percentage confirmed with qualitative methods | 0.04% | 0.4% | 3.4% | 0.2% |
ICTRP International Clinical Trials Registry Platform, ISRCTN International Standard Randomised Controlled Trial Number Registry, WHO World Health Organisation