TABELLA 247-1. RISCHIO DELLA
NASCITA DI UN
BAMBINO CON
UN’ANOMALIA CROMOSOMICA
Età materna |
Rischio di sindrome di Down |
Rischio di una qualche anomalia cromosomica* |
20 |
1/1667 |
1/526 |
22 |
1/1429 |
1/500 |
24 |
1/1250 |
1/476 |
26 |
1/1176 |
1/476 |
28 |
1/1053 |
1/435 |
30 |
1/952 |
1/384 |
32 |
1/769 |
1/323 |
34 |
1/500 |
1/238 |
35 |
1/385 |
1/192 |
36 |
1/294 |
1/156 |
37 |
1/227 |
1/127 |
38 |
1/175 |
1/102 |
39 |
1/137 |
1/83 |
40 |
1/106 |
1/66 |
41 |
1/82 |
1/53 |
42 |
1/64 |
1/42 |
43 |
1/50 |
1/33 |
44 |
1/38 |
1/26 |
45 |
1/30 |
1/21 |
46 |
1/23 |
1/16 |
47 |
1/18 |
1/13 |
48 |
1/14 |
1/10 |
49 |
1/11 |
1/8 |
*47,XXX esclusa per le età da 20 a 32 (dati non disponibili). Dati da Hook EB: "Rates of chromosome abnormalities at different maternal ages." Obstetrics and Gynecology 58:282285, 1981; and Hook EB, Cross PK, Schreinemach ers DM: "Chromosomal abnormality rates at amniocentesis and in live-born infants." Journal of the American Medical Association 249:20342038, 1983. |