Proportions of infants, who have survived a given number of days, by total length of survival. For example, if counselling the parents of an infant with trisomy 13 who has survived for 14 days then there is a 60% (35 to 85% CI) chance that the infant will survive to the age of 1 month and a 7% (0 to 19% CI) chance that they will survive for 1 year. The revised median survival times with confidence intervals that do not overlap with those calculated at birth are marked with an asterisk
| Observed length of survival (95% confidence limits) | ||||
|---|---|---|---|---|
| Time already survived | 1 day | 1 week | 1 month | 1 year |
| Trisomy 13 | ||||
| Birth | 75% (60 to 90) | 50% (33 to 67) | 28% (13 to 44) | 3% (0 to 9) |
| 1 day | 67% (48 to 86) | 38% (18 to 57) | 4% (0 to 12) | |
| 2 days | 76% (58 to 94) | 43% (22 to 64) | 5% (0 to 14) | |
| 7 days | 56% (32 to 81) | 6% (0 to 18) | ||
| 14 days | 60% (35 to 85) | 7% (0 to 19) | ||
| 30 days | 11% (0 to 32) | |||
| Trisomy 18 | ||||
| Birth | 88% (81 to 95) | 43% (32 to 53) | 25% (16 to 34) | 2% (0 to 6) |
| 1 day | 49% (37 to 60) | 28% (18 to 39) | 3% (0 to 6) | |
| 2 days | 58% (46 to 70) | 34% (22 to 46) | 3% (0 to 8) | |
| 7 days | 58% (42 to 74)* | 6% (0 to 13) | ||
| 14 days | 88% (74 to 100)* | 8% (0 to 19) | ||
| 30 days | 10% (0 to 22) | |||