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| Study | N | % re‐admitted | NNT(benefit) | Follow up (w) |
| George 1999 | 20 | 60 | 4 (3 to 19) | 24 |
| Morice 2001 | 40 | 28 | 8 (5 to 40) | 72 |
| Osman 2002 | 140 | 27 | 8 (6 to 42) | 52 |
| Perneger 2002 | 58 | 10 | 20 (14 to 112) | 24 |
| Yoon 1993 | 28 | 25 | 8 (6 to 45) | 40 |
