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| Trial | Generation of alloc | Concealment of alloc | Blinding | Follow‐up |
| Assalia 1993 | U | U | N | U |
| Coelho 1992a | A | U | N | U |
| Coelho 1993 | U | U | N | U |
| O'Dwyer 1992a | U | A | N | U |
| Schmitz 1997a | U | A | N | A |
| Seenu 1994 | U | U | N | U |
| Wani 2002 | U | U | N | U |
| A: Adequate | U: Unclear | I: Inadequate | N: Not performed |
