Table 4: Mean and standard deviation of the area of subchondral cavities in μm2 in different age group.

16–20 yrs 3 6 1 8 . 2 3 ± 1 8 6 5 . 4 3
21–30 yrs 6 6 0 8 . 1 9 ± 7 3 1 2 . 1 3
31–40 yrs 5 4 0 4 . 2 5 ± 1 5 4 9 . 5 5
41–50 yrs 3 8 4 5 . 2 5 ± 1 2 2 7 . 4 2
51–60 yrs 8 4 1 9 . 5 2 ± 2 6 7 3 . 3 8
61–70 yrs 2 8 8 5 . 5 8 ± 9 8 1 . 4 8
71–80 yrs 3 4 8 0 . 9 4 ± 1 7 0 2 . 9 7
81–90 yrs 3 6 5 3 . 0 3 ± 1 1 9 2 . 7 5