Table 2.
Characteristics of participating centres (quantitative variables)
| No. | Percentiles | ||||||
|---|---|---|---|---|---|---|---|
| Centres | Missing | 10th | 25th | 50th | 75th | 90th | |
| Number of biopsies per centre | 54 | 0 | 10.0 | 33.3 | 73.0 | 125.8 | 196.5 |
| Number of event-free biopsies per centre | 54 | 0 | 9.0 | 32.0 | 69.5 | 116.8 | 189.5 |
| Number of biopsies per centre followed by a major event | 54 | 0 | 0.0 | 1.0 | 4.0 | 7.0 | 13.5 |
| Event frequency per centre (%) | 54 | 0 | 0.0 | 2.3 | 5.2 | 8.8 | 13.9 |
| Recruitment duration per centre (years) | 54 | 0 | 0.5 | 1.2 | 3.1 | 4.0 | 4.6 |
| Expected number of biopsies per year | 51 | 3 | 9.2 | 13.0 | 25.0 | 40.0 | 86.2 |
| Actual number of biopsies per year | 54 | 0 | 12.4 | 18.9 | 25.5 | 40.1 | 68.4 |
| Needle cutting section (mm) | 49 | 5 | 15 | 16 | 20 | 22 | 23 |
| Pre-biopsy anti-platelet drug discontinuation (days) | 53 | 1 | 5 | 7 | 7 | 7 | 10 |
| Number of physicians in renal biopsy team | 53 | 1 | 2 | 2 | 2 | 2 | 3 |