Table 2.

Univariable and multivariable linear regression analysis of the association between BMI and obesity with clinical outcome.

Dependent Variables	Predicting Variables	Univariable Analysis, B (95% CI)	p	Multivariable Analysis^*, B (95% CI)	p
BASDAI	BMI	0.056 (0.011–0.101)	0.014	0.047 (−0.004–0.099)	0.072
BASDAI	Obesity	0.841 (0.341–1.341)	0.001	0.629 (0.080–1.179)	0.025
ASDAS	BMI	0.036 (0.016–0.057)	< 0.001	0.033 (0.010–0.057)	0.005
ASDAS	Obesity	0.526 (0.299–0.752)	< 0.001	0.497 (0.248–0.746)	< 0.001
CRP (log)	BMI	0.015 (0.006–0.023)	0.001	0.017 (0.007–0.026)	0.001
CRP (log)	Obesity	0.186 (0.092–0.279)	< 0.001	0.231 (0.130–0.333)	< 0.001
ESR (log)	BMI	0.013 (0.005–0.021)	0.003	0.013 (0.003–0.022)	0.009
ESR (log)	Obesity	0.116 (0.020–0.211)	0.017	0.118 (0.015–0.220)	0.024
BASFI	BMI	0.133 (0.083–0.183)	< 0.001	0.073 (0.019–0.128)	0.009
BASFI	Obesity	1.609 (1.056–2.163)	< 0.001	1.040 (0.460–1.619)	< 0.001
ASQoL	BMI	0.147 (0.042–0.252)	0.006	0.086 (−0.031–0.204)	0.150
ASQoL	Obesity	2.891 (1.744–4.038)	< 0.001	2.157 (0.878–3.435)	0.001

↵* Adjusted for age, sex, symptom duration, HLA-B27 status, and comorbidity. BMI: body mass index; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; ASDAS: Ankylosing Spondylitis Disease Activity Score; CRP: C-reactive protein; ESR: erythrocyte sedimentation rate; BASFI: Bath Ankylosing Spondylitis Functional Index; ASQoL: Ankylosing Spondylitis Quality of Life questionnaire.