| Study | Number of pregnancies | Total fetal losses | Loss <20 weeks | Loss >20 weeks | Hydrops |
| Anand, A, et al. N Engl J Med 1987 | 6 | 2 | - | - | - |
| Schwartz, TF, et al. Lancet 1988 | 34 | 7 | - | 7 | 10 |
| Rodis, JF, et al. Am J Obstet Gynecol 1990* | 39 | 2 | 2 | 0 | 0 |
| British Working Party, BMJ 1990* | 186 | 30 | 27 | 3 | 1 |
| Guidozzi, F, et al. J Reprod Med 1994* | 63 | 1 | 1 | 0 | 0 |
| Gratacos, E, et al. J Infect Dis 1995* | 60 | 5 | 5 | 0 | 0 |
| Enders, M, et al Prenat Diagn 2004 | 1018 | 64 | 64 | 0 | 40 |
