Infertility and spontaneous abortion - Spontaneous abortion, habitual abortion
Intrauterine mortality
Number of conceptions expected to reach each stage of pregnancy
J Kline, Conception to birth—epidemiology of prenatal development, Monographs in Epidemiology and Biostatistics, Oxford University Press, Oxford (1989).
Intrauterine mortality table
| Weeks after fertilization | Ongoing pregnancies | Chromosome abnormalities |
| 0 | 100 | |
| 1 | 82 |
Trisomy 17 Autosomal monosomy |
| 2 | 50 | |
| 3 | Trisomy 16, tetraploidy | |
| 4 | Trisomy 22 | |
| 5 | Triploidy | |
| 6 | 44 | Monosomy X |
| 10 | 40.5 | |
| 14 | 38.6 | |
| 18 | 38.0 | |
| 22 | 37.6 | |
| 26 | 37.5 | |
| 30 | 37.4 | |
| 34 | 37.3 | |
| 38 | 37.1 | |
| Live births | 36.9 |
Modified from Leridon H (1977) Human fertility. Chicago Press.