You also need to know the percentage of children that become prodigies before you can calculate exactly how much more likely they are to become elite adults.

e.g. If 1% of children are prodigies, prodigies are around 10x as likely to become elite as non-prodigies.

If 0.1% of children are prodigies, prodigies are around 100x as likely to become elite as non-prodigies.

Or in the rather unlikely case that 10% of children are prodigies, non-prodigies become elite at exactly the same rate as prodigies - 10%.