Predictors of functional deterioration in Chinese patients with Psoriatic arthritis: a longitudinal study

Table 3 Multivariate regression analysis of variables associated with HAQ at follow up

Clinical variables	Standardized coefficients (Beta)	95% CI	p	Collinearity statistics
				Tolerance	VIF
(Constant)			0.005
Age	0.187	0.000, 0.011	0.041	0.994	1.0006
Damaged joint	0.174	-0.001, 0.027	0.062	0.958	1.044
PCS	-0.403	-0.023, -0.009	<0.0001	0.963	1.038

CI = confident intervals. PCS = Hong Kong norm based Physical component Summary of SF36.
Clinical variables entered into multivariate analysis.
Age, gender, duration of psoriatic arthritis (years), Education (years), concurrent illness (yes/no), body mass index, sacroiliitis (yes/no), tender joint count, swollen joint count, damaged joint count, ESR, Maastricht Ankylosing Spondylitis Entheses Score, Psoriasis area-and-severity index, physician’s global assessments of disease activity, patients’ global perception of joint and skin disease activity, pain score, Hong Kong norm based Physical component Summary of SF36 (PCS), Hong Kong norm based Mental component Summary of SF36 (MCS), ever used disease modifying anti-rheumatic drugs (DMARDs) and ever used biological DMARDs.

ISSN: 1471-2474