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Table 3 Average weekly percentage of children with back pain in each grade and survey year

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

School grade in survey year 1 Average weekly % (n) of children with back pain
  Survey year 1 Survey year 2 Survey year 3
0 1% (n = 1) 1% (n = 2) 2% (n = 3)
1 1% (n = 2) 1% (n = 3) 1% (n = 3)
2 5% (n = 7) 3.5% (n = 9) 3% (n = 8)
3 3% (n = 4) 2% (n = 5) 2% (n = 5)
4 3.5% (n = 5) 3% (n = 7) 3% (n = 6)