Dissemination of clinical trial results following trial CD for all, lead, paediatric and adult trials
| All trials | Lead trials | Paediatric trials | Adult trials | |||||
| Total | 305 | 100% | 75 | 100% | 53 | 100% | 248 | 100% |
| Posting summary results | ||||||||
| No results posted | 175 | 57.4% | 67 | 89.3% | 32 | 60.4% | 140 | 56.5% |
| Results posted | 120 | 39.3% | 5 | 6.7% | 20 | 37.7% | 99 | 39.9% |
| Results submitted | 10 | 3.3% | 3 | 4.0% | 1 | 1.9% | 9 | 3.6% |
| Posting time on ClinicalTrials.gov among trials with results posted | ||||||||
| Before trial completion | 4 | 1.3% | 0 | 0.0% | 1 | 1.9% | 3 | 1.2% |
| ≤12 months after CD | 19 | 6.2% | 1 | 1.3% | 4 | 7.5% | 15 | 6.0% |
| >12 ≤ 24 months after CD | 36 | 11.6%* | 1 | 1.3% | 8 | 15.1% | 27 | 11.0%† |
| >24 ≤ 36 months after CD | 20 | 6.6% | 2 | 2.8%‡ | 4 | 7.5% | 16 | 6.5% |
| >36 ≤ 48 months after CD | 17 | 5.6% | 1 | 1.3% | 2 | 3.8% | 15 | 6.0% |
| >48 ≤ 60 months after CD | 9 | 3.0% | 0 | 0.0% | 1 | 1.9% | 8 | 3.2% |
| >60 ≤ 72 months after CD | 6 | 2.0% | 0 | 0.0% | 0 | 0.0% | 6 | 2.4% |
| >72 months after CD | 9 | 3.0% | 0 | 0.0% | 0 | 0.0% | 9 | 3.6% |
| Publication found | ||||||||
| Yes | 218 | 71.5% | 57 | 76.0% | 36 | 67.9% | 180 | 72.6% |
| No | 87 | 28.5% | 18 | 24.0% | 17 | 32.1% | 68 | 27.4% |
| Where was publication found? | ||||||||
| ClinicalTrials.gov | 144 | 47.2% | 35 | 46.7% | 24 | 45.2%§ | 119 | 48.0% |
| PubMed | 8 | 2.6% | 0 | 0.0% | 1 | 1.9% | 7 | 2.8% |
| Google Scholar | 64 | 21.0% | 22 | 29.3% | 11 | 20.8% | 53 | 21.4% |
| Web of Science | 2 | 0.7% | 0 | 0.0% | 0 | 0.0% | 1 | 0.4% |
| Publication time | ||||||||
| Before trial completion | 20 | 6.6% | 4 | 5.3% | 1 | 1.9% | 18 | 7.3% |
| ≤24 months after CD | 103 | 33.8% | 35 | 46.7% | 19 | 35.8% | 83 | 33.5% |
| >24 ≤ 36 months after CD | 52 | 17.0% | 7 | 9.3% | 8 | 15.1% | 44 | 17.7% |
| >36 ≤ 48 months after CD | 26 | 8.5% | 6 | 8.0% | 3 | 5.7% | 23 | 9.3% |
| >48 ≤ 60 months after CD | 8 | 2.6% | 3 | 4.0% | 4 | 7.5% | 4 | 1.6% |
| >60 ≤ 72 months after CD | 7 | 2.3% | 2 | 2.7% | 1 | 1.9% | 6 | 2.4% |
| >72 months after CD | 2 | 0.7% | 0 | 0.0% | 0 | 0.0% | 2 | 0.8% |
| Pooled dissemination | ||||||||
| Posting summary results within 12 months¶ | 23 | 7.5% | 1 | 1.3% | 5 | 9.4% | 18 | 7.3% |
| Publishing results within 24 months¶** | 123 | 40.3% | 39 | 52.0% | 20 | 37.7% | 101 | 40.7% |
| Posting and/or publishing results†† | 131 | 43.0% | 39 | 52.0% | 21 | 39.6% | 108 | 43.5% |
| Posting and publishing results‡‡ | 15 | 4.9% | 1 | 1.3% | 4 | 7.5% | 11 | 4.4% |
| Overall dissemination§§ | 243 | 79.7% | 57 | 76.0% | 39 | 73.6% | 201 | 81.0% |
*The percentage was calculated by subtracting the remaining % values from 39.3%.
†The percentage was calculated by subtracting the remaining % values from 39.9%.
‡The percentage was calculated by subtracting the remaining % values from 6.7%
§The percentage was calculated by subtracting the remaining % values from 67.9%.
¶Study results posted on ClinicalTrials.gov before CD or within 12 months after CD
**Study results published as a journal publication before CD or within 24 months after CD.
††Study results posted on ClinicalTrials.gov before CD or within 12 months after CD and/or published as a journal publication before CD or within 24 months after CD.
‡‡Study results posted on ClinicalTrials.gov before CD or within 12 months after CD and published as a journal publication before CD or within 24 months after CD.
§§Study results posted and/or published as of 7 February 2019.
CD, completion date.