- Demographic characteristics of randomized-controlled trials in countries* under Gulf Cooperation Councils (GCC) 1990 to 2018 (n=406).
| Characteristics | n | Min | Max | Mean | SD |
|---|---|---|---|---|---|
| Sample size | 404 | 10 | 10600 | 201.96 | 639.1 |
| Overall mean age (in year) | 322 | 0.54 | 77.00 | 33.83 | 18.0 |
| Overall Proportion of females | 292 | 0.42% | 100.0% | 46.62% | 29.5% |
| n | % | ||||
| Sample source | General population | 1 | 0.2 | ||
| Hospital/clinics | 377 | 92.9 | |||
| Others | 28 | 6.9 | |||
| Geographical location | Saudi Arabia | 288 | 70.9 | ||
| Kuwait | 58 | 14.3 | |||
| Bahrain | 2 | 0.5 | |||
| UAE | 25 | 6.1 | |||
| Oman | 6 | 1.5 | |||
| Qatar | 21 | 5.2 | |||
| Collaboration within GCC countries | 6 | 1.5 | |||
| Registered protocol | Yes | 86 | 21.2 | ||
| No | 320 | 78.8 | |||
| Number of study centers | Single center | 354 | 87.2 | ||
| Multi-center | |||||
| 2 - 25 | 39 | 9.6 | |||
| >25 | 4 | 1.0 | |||
| Not numbered | 9 | 2.2 | |||
| Field of study | Medicine | 319 | 78.6 | ||
| Dentistry | 52 | 12.8 | |||
| Infectious disease | 13 | 3.2 | |||
| Oncology | 11 | 2.7 | |||
| Other | 11 | 2.7 | |||
*Saudi Arabia, Bahrain, United Arab of Emirates, Kuwait, Oman, and Qatar, SD: standard deviation