| Sample type | radius match | nuclear matching | 1:4 near-neighbour Matching in calipers | ||||||
| Unmatched samples | matched sample | total | Unmatched samples | Matched sample | total | Unmatched samples | Matched sample | total | |
| control group | 2700 | 14,168 | 16,868 | 2712 | 14,286 | 16,998 | 2700 | 14,168 | 16,868 |
| treatment group | 0 | 1415 | 1415 | 0 | 1415 | 1415 | 0 | 1415 | 1415 |
| total | 2700 | 15,583 | 18,283 | 2712 | 15,701 | 18,413 | 2700 | 15,583 | 18,283 |