Table 2.

Results of the final multiple regression models showing the ability of psychological variables to explain the variance in RM scores, over and above that explained by the functional test index scores

MODEL and variables selected for inclusion at each step	Standardised beta coefficient	R2	Adjusted R2	Step increase in adj. R2 (%)	p value, R2 step change
Baseline data
Step 1—forced entry
Functional test index score	0.472	0.36	0.34		0.0001
Step 2—stepwise selection
FAB-work	0.457	0.55	0.53	19	0.001
Post-therapy data
Step 1—forced entry
Functional test index score	0.603	0.46	0.44		<0.0001
Step 2—stepwise selection
Psychological disturbance (MSPQ and ZUNG score)	0.294	0.54	0.51	7	<0.05
Longitudinal (change-score) data
Step 1—forced entry
Change score, functional test index score	0.468	0.30	0.28		0.001
Step 2—stepwise selection
Change score, catastrophising	0.500	0.54	0.51	23	0.001