4 ms·

100% - >25% by age 11 - 70% before 18 = <5% after 18. I assume the "while" means the former isn't included in the latter.

• falcor84 1y ago
  I think this would be a more realistic percentage, but this interpretation of the grammar doesn't work for me.
  • jolmg 1y ago
    I see it as a comparison of 2 groups of people. Seems weird to include the same group on both sides of the comparison.