Among males in the classic event, annual change was -0.08% during ages 20-29, -0.33% during 30-39, -0.26% during 40-49, followed by slowing of 0.77%, 1.20%, and 2.43% per year during 50-59, 60-69, and 70-75.
Females in the classic event showed corresponding estimates of -0.60%, -0.63%, 0.07%, 0.53%, 1.03%, and 2.27% per year.
The improvement during ages 30-39 was statistically distinguishable from zero in all four technique-gender groups.