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. 2014 Nov 18;22:35. doi: 10.1186/s12998-014-0035-6

Table 3.

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

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)