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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