Um, are you having reading comprehension problems? Bad case of the Mondays?
I wrote (in the post you responded to):
Maternal age influences the chances of conceiving a baby with Down syndrome. At maternal age 20 to 24, the probability is one in 1562
It's right there, in black and white. A 20 year old has a 1:1562 chance of conceiving a Down Syndrome baby.
There was absolutely no need for you to take an insulting tone. If you wanted a different piece of information, or clarification, you could have asked nicely.
I didn’t mean the tone to be insulting, I apologize for that.
But the remark stands. Your comment made the point that looking at probabilities didn’t tell the whole story.
You then said “Although the probability increases with maternal age, 80% of children with Down syndrome are born to women under the age of 35,”
What you need to make that point is what percentage of children with down syndrome are born to 20-year-old girls, NOT the percent of children born to 20-year-old girls who have downs syndrome. Although if we had the number of births to 20-year-old-girls, we could figure out the other thing.
My point was that, while it is more likely that a downs syndrome child was born to an under-35 mother than an over-35 mother, what we want to know is whether it was more likely a down syndrome child was born to a 20-year-old or a 40+ year-old.
It’s really your point, focused on the actual situation.