Table 2

Multivariate regression analyses of the association between the Knee Injury and Osteoarthritis Outcome Score subscales, the Anterior Knee Pain Scale and functional tasks with patellofemoral and tibiofemoral OA severity (grade 0–3)

Dependent variable	Independent variable	β	B	95% CI of B	p Value
KOOS-pain	Patellofemoral OA	−0.3	−3.6	−7.0 to −0.1	0.042
	Tibiofemoral OA	−0.3	−3.8	−7.3 to −0.2	0.037
KOOS-symptoms	Patellofemoral OA	−0.4	−7.0	−12.3 to −1.7	0.011
KOOS-symptoms	Tibiofemoral OA	−0.2	−3.2	−8.6 to 2.3	0.251
KOOS-ADL	Patellofemoral OA	−0.2	−3.5	−9.9 to 2.8	0.268
	Tibiofemoral OA	0.0	0.6	−5.9 to 7.1	0.850
KOOS-SR	Patellofemoral OA	−0.2	−3.2	−9.0 to 2.7	0.281
	Tibiofemoral OA	−0.3	−5.8	−11.8 to 0.2	0.058
KOOS-QOL	Patellofemoral OA	−0.5	−13.0	−20.3 to −5.8	0.001
	Tibiofemoral OA	−0.2	−5.8	−13.2 to 1.6	0.124
AKPS	Patellofemoral OA	−0.5	−8.0	−12.8 to −3.3	0.001
	Tibiofemoral OA	−0.1	−1.8	−6.6 to 3.1	0.468
Hop for distance*	Patellofemoral OA	−0.3	−13.6	−23.6 to −3.5	0.009
	Tibiofemoral OA	−0.2	−7.9	−18.0 to 2.2	0.123
Side hop*	Patellofemoral OA	−0.4	−6.5	−10.1 to −3.0	0.001
	Tibiofemoral OA	−0.1	−2.0	−5.6 to 1.6	0.260
One-leg rise†	Patellofemoral OA	−0.3	−6.3	−11.8 to −0.8	0.026
	Tibiofemoral OA	0.0	0.1	−5.6 to 5.7	0.980

N=60 for patient-reported outcomes, N=65 for functional tasks.
*Adjusted for height, age and gender.
†adjusted for weight.
β, standardised regression coefficient; ADL, function in activities of daily living; AKPS, Anterior Knee Pain Scale; B, unstandardised regression coefficient; KOOS, Knee Injury and Osteoarthritis Outcome Score; OA, osteoarthritis; QOL, quality of life; SR, function in sport and recreation.