Table 5

Predictors of valued life activity disability

Variable		Demographic and symptom measures only					Adding HAQ to regression model
Variable		Total	Obligatory	Committed	Discretionary		Total	Obligatory	Committed	Discretionary
Numerical values are the regression parameters (b) from multiple regression analyses. Symbols indicate significance level of variable in multiple regression models:
*p<0.05; †p<0.01; ‡p<0.001; §p<0.0001.
The increase in R² for models when HAQ was entered was significant at p<0.0001 in all cases.
Commit, committed; Disc, discretionary; HAQ, health assessment questionnaire; Oblig, obligatory; RA, rheumatoid arthritis.
Unable
Age		0.04§	0.0007	0.007	0.03§		0.01	−0.0005	−0.003	0.01†
Female		0.39	−0.03	0.22	0.20		−0.13	−0.05	0.005	−0.08
RA duration		0.04§	0.002*	0.01†	0.02‡		0.01	0.001	0.002	0.006
Pain rating		0.01*	−0.00004	0.002	0.008†		−0.003	−0.0006	−0.003	0.0007
No of painful joints		0.05	−0.00001	0.04*	0.009		−0.03	−0.004	0.007	−0.03
No of swollen joints		0.10*	0.009	0.03	0.06*		0.02	0.005	−0.001	0.01
Fatigue		1.26§	0.03	0.62§	0.62‡		0.724†	0.001	0.41‡	0.33*
AM stiffness		0.89§	0.001	0.35†	0.54†		0.64†	−0.01	0.25*	0.40†
Hands		0.26	−0.02	0.15	0.13		−0.02	−0.03	0.03	−0.02
Feet		0.47*	0.0	0.09	0.37†		−0.05	−0.02	−0.12	0.09
HAQ		–	–	–	–		2.44§	0.11§	0.99§	1.34§
Model R²		0.28	0.01	0.22	0.27		0.50	0.07	0.41	0.45

Affected
Age		−0.01	0.02†	−0.02‡	0.0004		−0.07§	−0.0004	−0.04§	−0.03‡
Female		0.53	−0.05	0.51*	0.08		−0.83	−0.40†	0.11	−0.55
RA duration		0.07‡	0.01*	0.02†	0.04‡		0.005	−0.003	0.001	0.007
Pain rating		0.07§	0.02§	0.02§	0.04§		0.04‡	0.007†	0.008*	0.02§
No of painful joints		0.23†	0.07†	0.07*	0.10*		0.04	0.02	0.01	0.009
No of swollen joints		0.31†	0.08†	0.08*	0.16†		0.09	0.02	0.01	0.05
Fatigue		3.18§	0.74§	0.70†	1.75§		1.81†	0.39†	0.31	1.12‡
AM stiffness		1.27	0.31	0.36	0.60		0.62	0.14	0.17	0.30
Hands		0.90	0.18	0.26	0.46		0.16	−0.007	0.05	0.12
Feet		1.58†	0.44†	0.63†	0.50		0.21	0.10	0.24	−0.12
HAQ		–	–	–	–		6.40§	1.63§	1.85§	2.92§
Model R²		0.38	0.36	0.29	0.34		0.60	0.58	0.46	0.52

Difficulty
Age		0.005‡	0.005‡	0.004*	0.006§		−0.0008	0.0003	−0.003*	0.0004
Female		0.06	−0.02	0.17†	0.03		−0.06	−0.12†	0.03	−0.09*
RA duration		0.007§	0.004†	0.008§	0.007§		0.0005	−0.0005	0.0007	0.0007
Pain rating		0.004§	0.02§	0.004§	0.005§		0.002†	0.001*	0.0008	0.002†
No of painful joints		0.02†	0.02†	0.02†	0.02		0.0005	0.004	0.002	−0.0007
No of swollen joints		0.03*	0.02†	0.03†	0.03		0.008	0.009	0.003	0.009
Fatigue		0.31§	0.22§	0.32§	0.34§		0.19§	0.13‡	0.17‡	0.22§
AM stiffness		0.19§	0.09*	0.25‡	0.20‡		0.13‡	0.05	0.18‡	0.14‡
Hands		0.06*	0.03	0.07	0.07		−0.005	−0.02	−0.01	0.004
Feet		0.14‡	0.12†	0.18‡	0.12†		0.02	0.02	0.03	0.009
HAQ		–	–	–	–		0.56§	0.44§	0.70§	0.54§
Model R²		0.43	0.37	0.40	0.42		0.75	0.61	0.69	0.69