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Table 1 The distribution of school grades in the subsequent survey years

From: Back pain in children surveyed with weekly text messages - a 2.5 year prospective school cohort study

First survey year →

Second survey year →

Third survey year →

Grade 0

Grade 1

Grade 2

Grade 1

Grade 2

Grade 3

Grade 2

Grade 3

Grade 4

Grade 3

Grade 4

Grade 5

Grade 4

Grade 5

Grade 6