Table 7.

Hierarchical regression modeling for health-related quality of life.

Dependent Variable	Model	Independent Variable	β	95% CI	p	Model p	Model R²	R² Change	R² Change p
Physical component scale	1	Age	−0.19	−0.26, −0.04	0.005	0.005	0.03	0.03	0.005
	2	Age	−0.23	−0.30, −0.07	0.001	0.002	0.06	0.02	0.02
		Hispanic	−0.15	−9.29, −0.56	0.02
	3	Age	−0.25	−0.31, −0.09	0.001	0.001	0.09	0.03	0.03
		Hispanic	−0.14	−8.80, −0.15	0.04
		SLEDAI	−0.17	−0.54, −0.70	0.01
		SDI	0.009	−0.68, 0.78	0.89
	4	Age	−0.24	−0.31, −0.09	0.001	0.001	0.11	0.02	0.02
		Hispanic	−0.12	−8.28, 0.33	0.07
		SLEDAI	−0.15	−0.50, −0.03	0.02
		SDI	0.03	−0.57, 0.89	0.66
		Education	0.15	0.20, 3.43	0.02
	5	Age	−0.26	−0.31, −0.10	0.001	0.001	0.13	0.02	0.03
		Hispanic	−0.12	−8.14, 0.39	0.07
		SLEDAI	−0.14	−0.49, −0.01	0.03
		SDI	0.02	−0.61, 0.84	0.74
		Education	0.12	−0.09, 3.15	0.06
		Z-AHI^*	0.14	0.39, 8.01	0.03

↵* US dollars (unit = 1000). SLEDAI: Systemic Lupus Erythematosus Disease Activity Index; SDI: American College of Rheumatology Damage Index; Z-AHI: zip code-based annual household income.