Strength

<30 Years

≥30 Years

Difference

<40%

10.8%

16.2%

−5.4%

40% - 50%

11.7%

25.5%

−13.8%

50%

24.3%

18.1%

6.2%

50% - 60%

17.5%

17.2%

0.3%

60% - 70%

16.9%

8.6%

8.3%

>70%

17.3%

6.5%

10.8%

Perceptual rate

55.7%

48.1%

7.6%