| PMC full text: | Published online 2014 Nov 18. doi: 10.1186/s12998-014-0035-6
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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) |