Table 1.
The characteristics of the 146 trials registered on ClinicalTrial.gov.
| Characteristics | Number | Percentage (%) | |
|---|---|---|---|
| Study type | |||
| Interventional | 85 | 58.22 | |
| Observational | 61 | 41.78 | |
| Registered year | |||
| 2004–2010 | 25 | 17.12 | |
| 2011–2016 | 46 | 31.51 | |
| 2017–2021 | 75 | 51.37 | |
| Enrollment | |||
| 0–100 | 53 | 36.30 | |
| 100–500 | 47 | 32.19 | |
| >500 | 45 | 30.82 | |
| Unknown | 1 | 0.68 | |
| Gender | |||
| Female only | 3 | 2.05 | |
| Both | 143 | 97.95 | |
| Participant age (year) | |||
| <18 | 11 | 7.53 | |
| ≥18 | 112 | 76.71 | |
| Both | 23 | 15.75 | |
| Status | |||
| Not recruiting | 23 | 15.75 | |
| Recruiting | 30 | 20.55 | |
| Completed | 69 | 47.26 | |
| Suspended | 1 | 0.68 | |
| Terminated/withdrawn | 10 | 6.85 | |
| Unknown | 13 | 8.91 | |
| Study results | |||
| Has results | 10 | 6.85 | |
| No results available | 136 | 93.15 | |
| Sponsor | |||
| University | 63 | 43.15 | |
| Hospital | 52 | 35.62 | |
| Industry/company | 14 | 9.59 | |
| Other | 17 | 11.64 | |
| Funding source | |||
| Industry | 15 | 10.27 | |
| Other | 131 | 89.73 | |
| Location | |||
| America | 58 | 39.73 | |
| Europe | 58 | 39.73 | |
| Asia | 9 | 6.16 | |
| Australia | 4 | 2.74 | |
| Unknown | 17 | 11.64 | |