Vitality and the course of limitations in activities in osteoarthritis of the hip or knee

Table 5 Factors associated with the course of self-reported limitations in activities in knee OA: results from the multivariate analysis*

	Prognostic factors entered into the model
	Model with body functions,	Model with body functions,
	comorbidity and cognitive functioning	comorbidity, cognitive functioning and psychological and social factors
R²	0. 373	0.388
Significant prognostic factors in the model ↓
WOMAC t0	0.539‡	0.479 ‡
Reduced ROM hip external at one-year follow-up	0.120∫	0.115 ∫
Increased pain at one-year follow-up	-0.177†	-0.172 †
Morbidity Count	-0.180†	-0.147 †
Vitality		0.157 †

*standardized β's are presented; † p < 0.05; ‡ p < 0.01; ∫ p < 0.1
OA: osteoarthritis; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; ROM: active assisted range of motion; R2: explained variance.