TABLE 2.
Sample sizes stratified by research objective and study groups for studies with two study groups
| Objective | Study group | Min | Q1a | Median | Q3a | Max |
|---|---|---|---|---|---|---|
| Descriptive (n = 5) | Group 1 | 10 | 20 | 22 | 25 | 28 |
| Group 2 | 10 | 10 | 11 | 19 | 32 | |
| Overall | 20 | 30 | 33 | 44 | 60 | |
| Analytical (n = 162) | Group 1 | 4 | 18.25 | 31 | 59 | 1404 |
| Group 2 | 3 | 13 | 20 | 37.75 | 5492 | |
| Overall | 7 | 34 | 55 | 98.25 | 6896 | |
| Predictive (n = 41) | Group 1 | 7 | 32 | 48 | 88 | 767 |
| Group 2 | 14 | 29 | 35 | 48 | 1025 | |
| Overall | 28 | 65 | 84 | 137 | 1792 | |
| Treatment effect (n = 6) | Group 1 | 5 | 10.25 | 17 | 30.5 | 43 |
| Group 2 | 5 | 9 | 16 | 30.5 | 36 | |
| Overall | 10 | 19.25 | 38 | 62.75 | 70 |
a
Q1, first quartile; Q3, third quartile.