Trials reporting participant age and race/ethnicity
| Age | Number of trials including participants of each age group |
| 0–18 | 30/142 (21%) |
| 18–65 | 132/142 (93%) |
| Over 65 | 71/142 (50%) |
| Race/ethnicity | Out of 53 trials reporting participant race/ethnicity, number of trials including each demographic |
| White | 42/53 (79%) |
| Asian, Pacific Islander or Indian | 31/53 (58%) |
| Black | 30/53 (56%) |
| Hispanic | 17/53 (33%) |
| Native American | 7/53 (13%) |
| Other | 31/53 (58%) |