Table 2. Logistic regression analysis predicting the incidence of back pain at T3 relative to T2.

Measure	OR	95% CI
Insomnia, T1	.942	.72–1.24
Insomnia, T2	1.36*	1.27–1.51
Gender, T1	1.50*	1.05–2.13
Age, T1	1.01	.99–1.03
Education, T1	.99	.93–1.05
Smoking, T1	.97	.71–1.33
Physical activity, T1	1.06	.98–1.15
Self-rated health, T2	.87	.64–1.16
CRP, T2	.973	.92–1.03
BMI, T2	1.01	.96–1.05

N = 1,714.

*P<0.05.

Data are given as odds ratio, 95% confidence interval.