Spinal pain in Danish school children – how often and how long? The CHAMPS Study-DK

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Published online 2017 Mar 27. doi: 10.1186/s12891-017-1424-5

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Table 2

Number of episodes per child by study year

Number of episodes	Study year 1 (2011–2012) (N ^a = 296)		Study year 2 (2012–2013) (N ^a = 393)		Study year 3 (2013–2014) (N ^a = 336)
1	60.1%	178	59.5%	234	55.7%	187
2	18.6%	55	20.6%	81	19.3%	65
3	8.8%	26	7.9%	31	11.3%	38
4	5.4%	16	4.8%	19	6.2%	21
5	4.0%	12	3.3%	13	3.9%	13
6	1.7%	5	1.5%	6	2.4%	8
≥7	1.4%	4	2.4%	9	1.2%	4
	100%	296	100%	393	100%	336
Median # episodes (IQR)	1 (1–2)		1 (1–2)		1 (1–2.5)
Mean # episodes (SD	1.9 (1.4)		1.9 (1.6)		1.9 (1.4)

^a = Number of children per school year