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 3

Length of episodes

Length of episode (weeks)	Study year 1 (2011–2012) (n ^a = 550)		Study year 2 (2012–2013) (n ^a = 746)		Study year 3 (2013–2014) (n ^a = 660)
1	59.1%	325	56.6%	422	51.2%	338
2	13.1%	72	14.7%	110	17.9%	118
3	7.4%	41	6.7%	50	7.3%	48
4	4.4%	24	4.9%	37	6.2%	41
5	3.6%	20	3.1%	23	2.9%	19
6	2.2%	12	1.5%	11	3.5%	23
7	2.2%	12	2.1%	16	1.5%	10
8	1.1%	6	1.5%	11	0.3%	2
9	1.1%	6	0.7%	5	0.4%	3
10	1.1%	6	0.9%	7	1.2%	8
11	1.1%	6	0.3%	2	0.5%	3
12	0.7%	4	0.4%	3	0.6%	4
≥13	2.9%	16	6.6%	49	6.5%	43
	100%	550	100%	746	100%	660
Median # weeks (IQR)	1 (1–3)		1 (1–3)		1 (1–3)
Mean # weeks (SD)	2.6 (2.9)		2.9 (3.3)		3 (3.3)

^a = Number of episodes per school year