Table 2 Number of ancillary studies in which study sites participated by size of study site
Number of ancillary studies | ||||||
|---|---|---|---|---|---|---|
Number of participants on SELECT | N sites of this size | None n (%) | One n (%) | Two n (%) | Three n (%) | Four n (%) |
≤25 participants | 167 | 130 (78 %) | 23 (14 %) | 6 (4 %) | 8 (5 %) | 0 (0 %) |
26–100 participants | 172 | 84 (49 %) | 48 (28 %) | 30 (17 %) | 10 (6 %) | 0 (0 %) |
101–500 participants | 74 | 20 (27 %) | 22 (30 %) | 18 (24 %) | 13 (18 %) | 1 (1 %) |
>500 participants | 12 | 2 (17 %) | 2 (17 %) | 3 (25 %) | 2 (17 %) | 3 (25 %) |
Total | 425 | 236 | 95 | 57 | 33 | 4 |