Table 3.

Improvements in ODI score from baseline to follow-up visits estimated by GEE after adjusting for age, gender, and BMI.

Parameter	β	SE	95% Wald CI	p-Value
All patients (ref: baseline)
1-week	−24.075	0.796	−25.634~−22.516	<0.001
1-month	−23.350	0.874	−25.064~−21.636	<0.001
3-month	−21.900	0.752	−23.375~−20.425	<0.001
6-month	−19.575	0.920	−21.378~−17.772	<0.001
Patients with FJ pain (ref: baseline)
1-week	−22.813	1.367	−25.492~−20.133	<0.001
1-month	−22.938	1.614	−26.101~−19.774	<0.001
3-month	−21.563	1.375	−24.257~−18.868	<0.001
6-month	−19.813	1.680	−23.105~−16.520	<0.001
Patients with FJ and SIJ pain (ref: baseline)
1-week	−24.917	0.924	−26.728~−23.106	<0.001
1-month	−23.625	0.979	−25.543~−21.707	<0.001
3-month	−22.125	0.853	−23.796~−20.454	<0.001
6-month	−19.417	1.046	−21.466~−17.376	<0.001

ref: reference. β: beta value. SE: standard error. CI: confidence interval. BMI: body mass index. FJ: facet joint. SIJ: sacroiliac joint. Bold fonts indicate statistical significance.