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Table 1 Number of subjects by grade and age at baseline and 6-month follow-up

From: Changes in quality of life among Norwegian school children: a six-month follow-up study

   Baseline Six-month follow-up
Grade Age (years) n n
4th 8–10 505 490
6th 10–12 462 447
8th 12–14 492 383
10th 14–16 538 501
Total 8–16 1997 1821