Comparison of number of transplants evaluated in a variety of studies
| Study | Tissue | Matching | Cohort | Number of transplants |
| Stark et al(CCTS)18 | Cornea | DR | 1986–7 | 419 |
| Baggesen et al 16 | Cornea | DR | 1988–90 | 51 |
| Bradleyet al(CTFS)17 | Cornea | DR | 1987–91 | 542 |
| Opelz21 | Kidney | DR | 1988–91 | 3455 |
| UKTSSA24 | Kidney | A, B, and DR | 1984–93 | 10 804 |
| Opelz and Wujciak25 | Heart | A, B, and DR | 1985–92 | 8331 |