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Table 1 Registered trials using qualitative methods by registry

From: Exploring qualitative methods reported in registered trials and their yields (EQUITY): systematic review

 

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%

  1. ICTRP International Clinical Trials Registry Platform, ISRCTN International Standard Randomised Controlled Trial Number Registry, WHO World Health Organisation