Table3. Hierarchical Multivariate Analysis of Demographic, Medical, Psychological Variables in Relationship to BASDAI^*.

Step	Predictors	β weights	C.I. (95%)	P Value	R2 (%) (P Value+)**	ΔR2 (%) (P Value+)***
1	Demographics				13.8 (<0.001) *	------
	Age	0.15	−0.06-0.36	0.157
	Employment	−0.13	−0.26-0.01	0.061
	Sex	−0.08	−0.20-0.04	0.186
	Marital	0.06	−0.06-0.19	0.330
	Education	−0.03	−0.16-0.09	0.597
	Smoking	0.02	−0.10-0.14	0.748
	Student	−0.03	−0.18-0.12	0.737
	Ethnicity	−0.13	−0.25- −0.01	0.034
2	Medical Variables				18.1 (<0.001) **	4.3 (0.814) ***
	NSAID therapy	0.11	−0.01-0.23	0.076
	Bath AS Radiographic Index (BASRI)	0.01	−0.13-0.14	0.901
	Biologic therapy	−0.02	−0.14-0.09	0.726
	No. Medical Co- morbidities	−0.08	−0.21-0.05	0.203
	C-reactive Protein (CRP)	−0.07	−0.19-0.05	0.236
	Disease duration	−0.02	−0.21-0.17	0.811
3	Psychological Variables				51.4 (<0.001) **	33.3(<0.001) ***
	Arthritis Internality	−0.19	−0.32- −0.06	0.005
	Arthritis Helplessness	0.16	0.02-0.31	0.029
	Resilience Coping (BRCS)	0.08	−0.04-0.19	0.203
	Depression (PHQ-9)	0.34	0.19-0.49	<0.0001
	Active Coping	0.11	−0.01-0.24	0.072
	Passive Coping	0.16	0.02-0.29	0.027

^*All β-weights, 95% Confidence Intervals, and p values for individual variables are estimates derived in the context of the full model (i.e. with all three conceptual blocks entered in to the equation).

^**Overall R-Square (%) after the addition of each conceptual block and accompanying P value for the test of the overall R-Square.

^***Incremental R-Square change due to the addition of the conceptual block and accompanying P value for the test of the incremental R-Square change