Table 1 Distribution of parental age and number of children born in 69 Down syndrome cases and 200 control families.
From: Influence of advanced age of maternal grandmothers on Down syndrome
Age range (in years) | No. of children at different age range born to | |||||
|---|---|---|---|---|---|---|
Mother | Father | Maternal Grandmother | ||||
Downs | Controls | Downs | Controls | Downs | Controls | |
18–24 | 34 | 312 | 01 | 59 | 03 | 548 |
25–29 | 18 | 133 | 20 | 160 | 03 | 204 |
30–34 | 12 | 56 | 29 | 208 | 37 | 96 |
35–40 | 05 | 12 | 13 | 65 | 24 | 06 |
> = 41 | - | 08 | 06 | 29 | 02 | 04 |
Total | 69 | 521 | 69 | 521 | 69 | 858 |