Table 2 Median sample size per arm overall and split by study type, endpoint and funder
N | Target sample size | |||
|---|---|---|---|---|
Median (IQR) | Minimum | Maximum | ||
All studies | 761 | 30 (20–50) | 4 | 1598 |
Study type | ||||
Pilot | 244 | 30 (20–55) | 4 | 1598 |
Feasibility | 448 | 30 (21–43) | 5 | 400 |
Both | 69 | 33 (20–50) | 8 | 125 |
Endpoint | ||||
Binary | 97 | 50 (25–81) | 5 | 400 |
Categorical | 1 | 200 (200–200) | 200 | 200 |
Continuous | 592 | 30 (20–43) | 4 | 1598 |
Time to event | 24 | 39 (30–51) | 10 | 125 |
Unknown | 47 | 30 (22–41) | 10 | 100 |
Funder | ||||
Charity | 137 | 30 (20–42) | 5 | 1598 |
Industry | 50 | 30 (20–60) | 6 | 350 |
Public | 557 | 30 (21–50) | 4 | 650 |
Other | 17 | 20 (15–25) | 5 | 80 |