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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