. 2010 Dec 17;20(2):274–279. doi: 10.1007/s00586-010-1657-6

Table 3.

Characteristics of back pain among pupils with the lifetime prevalence and their association with scoliosis

	Scoliosis group		No scoliosis group		Gender- and school-grade-adjusted
	N = 31		N = 10,561		OR	(95% CI)	P value
	No.	%	No.	%	OR	(95% CI)	P value
Duration of back pain
≤1 week	12	38.7	6,814	68.1^a	1.00	(reference)
1 week<, ≤1 month	5	16.1	1,873	18.7^a	1.50	(0.52, 4.29)	0.450
1 month<, ≤3 months	2	6.5	552	5.5^a	1.94	(0.43, 8.76)	0.390
>3 months	11	35.5	772	7.7^a	7.92	(3.39, 18.51)	<0.001
Recurrence of back pain	26	83.9	6,028	60.1^b	3.94	(1.37, 11.36)	0.011
Severity of back pain
Level 1	20	64.5	8,539	80.9	1.00	(reference)
Level 2	3	9.7	1,631	15.7	0.80	(0.24, 2.72)	0.722
Level 3	7	22.6	391	3.8	6.96	(2.89, 16.78)	<0.001

OR odds ratio of each back-pain status according to scoliosis, CI confidence interval

^aCalculated for 10,011 pupils excluding 550 non-respondents

^bCalculated for 10,036 pupils excluding 528 non-respondents