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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