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| Study | Number of deaths in the immunoglobulin group | Immunoglobulin group total | Number of deaths in the placebo group | Placebo group total |
| Hemming 1987 | 1 death (study group unknown) | |||
| Malley 1998 | 0 | 17 | 1 | 18 |
| Rodriguez 1997a | 2 | 51 | 0 | 50 |
| Sáez‐Llorens 2004 | 0 | 30 | 1 | 29 |
