Table 3. Functional disability and QoL predictors in combined SSc patients.

	B	SE	ß	p	95% CI (Factor B)
HAQ
Pain (VAS)	0.089	0.013	0.397	<0.001	0.064-0.113
Disease duration	0.014	0.004	0.208	<0.001	0.007-0.022
FVC	-0.007	0.002	-0.172	0.002	[-0.012-(-0.003)]
6 Minute Walk Test	-0.001	0.000	-0.161	0.005	-0.001-0.000
	Model 1 R2=0.25 (p<0.001); Model 2 R2=0.11 (p<0.001)
SHAQ
Pain (VAS)	0.080	0.011	0.397	<0.001	0.057-0.102
mRSS	0.011	0.002	0.250	<0.001	0.006-0.015
	Model 1 R2=0.21 (p<0.001); Model 2 R2=0.06 (p<0.001)
DHI
Pain (VAS)	3.180	0.381	0.446	<0.001	2.430-3.931
mRSS	0.354	0.082	0.233	<0.001	0.192-0.515
Disease duration	0.322	0.116	0.147	0.006	0.094-0.550
	Model 1 R2=0.27 (p<0.001); Model 2 R2=0.08 (p<0.001)
SF-36 PCS
Pain (VAS)	-3.783	0.514	-0.417	<0.001	[-4.796-(-2.770)]
FVC	0.314	0.092	0.187	0.001	0.133-0.496
6 Minute Walk Test	0.028	0.010	0.153	0.009	0.007-0.048
Disease duration	-0.379	0.153	-0.134	0.014	[-0.680-(-0.078)]
	Model 1 R2=0.26 (p<0.001); Model 2 R2=0.09 (p<0.001)
SF-36 MCS
Pain (VAS)	-4.154	0.479	-0.478	<0.001	[-5.097-(-3.212)]
	R2=0.23 (p<0.001)
QoL: Quality of life; SSc: Systemic sclerosis; CI: Confidence interval; HAQ: Health Assessment Questionnaire; VAS: Visual Analog Scale; FVC: Forced vital capacity; SHAQ: Scleroderma HAQ; DHI: Duruöz Hand Index; mRSS: Modified Rodnan skin score; SF-36: Short form 36; PCS: Physical Component Score; MCS: Mental Component Score.