Table 1 Sharp score is positively associated with Health Assessment Questionnaire (HAQ) score independently of Disease Activity Score (DAS): generalised mixed linear modelling*

Parameter	Regression coefficient	p Value	95% CI of the regression coefficient
Parameter	Regression coefficient	p Value	Lower bound	Upper bound
Intercept	−0.125	0.26	−0.342	0.092
Sex (F)	−0.243	<0.001	−0.333	−0.152
Age (years)	0.0103	<0.001	0.0073	0.0133
Disease duration (years)	0.0059	0.174	−0.0026	0.0143
CRP (mg/dl)	0.0029	<0.001	0.0014	0.0044
Treatment	0.0104	0.67	−0.0369	0.0577
DAS	0.255	<0.001	0.240	0.2688
Sharp score (Sharp units)	0.0019	<0.001	0.0011	0.0027

*Dependent variable: HAQ.
CRP, C-reactive protein.