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Table 1 Definition of age segments and number of individuals per age segment

From: Age-related changes of fibroblast density in the human periodontal ligament

Age segment

No. 1

No. 2

No. 3

No. 4

No. 5

No. 6

Age range (in years)

0-9y

10-19y

20-29y

30-39y

40-49y

> = 50y

Number of individuals

1

4

8

11

6

3

Average age in segment (in years)

7.0

17.0

23.6

33.7

45.1

54.7