4. Concealment of allocation and Jadad scores.
| Study ID | Concealment score | Jadad score |
| Challenor 1991 | B | 3/5 |
| Ettinger 1984 | B | 3/5 |
| Jaffe 1980 | B | 3/5 |
| Le Quentrec 1991 | A | 5/5 |
| Madsen 1984 | B | 3/5 |
| Rustin 1987 | B | 3/5 |
| van de Wal 1987 | B | 3/5 |
| Vayssairat 1996 | B | 5/5 |
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