Table 2:
Mean and standard deviation of the area of the lacunae in
μ
m
2
.
Zone 1
Zone 2
Zone 3
Zone 4
16–20 yrs
8
5
.
9
9
±
0
.
4
9
1
6
5
.
3
8
±
1
3
.
8
9
1
7
0
.
6
7
±
5
.
7
7
1
5
1
.
5
2
±
1
9
.
1
7
21–30 yrs
4
6
.
6
4
±
1
2
.
6
3
1
5
7
.
7
9
±
4
5
.
2
9
1
5
7
.
9
7
±
1
7
.
6
2
1
6
0
.
3
0
±
3
4
.
9
9
31–40 yrs
6
0
.
1
2
±
3
3
.
9
5
1
4
1
.
3
0
±
7
.
4
7
1
6
6
.
2
4
±
2
1
.
1
6
1
7
4
.
9
3
±
4
9
.
4
8
41–50 yrs
5
5
.
7
3
±
2
.
8
0
1
5
6
.
1
1
±
3
4
.
2
2
2
0
0
.
6
5
±
4
.
4
6
1
3
1
.
5
7
±
1
2
.
5
1
51–60 yrs
7
7
.
7
5
±
8
.
4
2
1
4
7
.
0
7
±
1
4
.
3
7
2
1
8
.
4
4
±
3
6
.
1
8
1
5
9
.
0
6
±
3
8
.
9
8
61–70 yrs
3
5
.
9
9
±
0
.
4
2
2
0
4
.
6
0
±
3
4
.
2
1
2
2
5
.
6
5
±
1
0
6
.
5
2
1
6
0
.
4
2
±
4
4
.
2
3
71–80 yrs
6
1
.
5
0
±
3
0
.
3
5
1
8
9
.
7
3
±
4
.
7
7
1
9
8
.
1
4
±
1
4
.
3
3
1
0
5
.
4
9
±
4
.
5
9
81–90 yrs
6
1
.
2
8
±
1
5
.
9
0
1
5
4
.
6
3
±
4
.
3
8
1
9
2
.
3
5
±
4
3
.
7
5
1
5
6
.
7
5
±
3
0
.
6
9