Table 4.

Multivariable linear regression analysis of factors associated with the HOOS JR at baseline, accounting for factor 1 pain coping and factor 2 mood

Variable	Regression coefficient (95% CI)	Standard error	Partial R2	p value
Factor 1: Pain coping	-5.4 (-7.8 to -3.1)	1.2	0.10	< 0.001
Factor 2: Mood	0.51 (-1.8 to 2.9)	1.2	0.0010	0.67
Kellgren-Lawrence grade	-0.41 (-2.0 to 1.2)	0.82	0.0013	0.61
Employment status
Employed	Reference value
Unemployed	2.5 (-7.4 to 12)	5.0	0.0013	0.62
Retired	4.0 (-0.16 to 8.1)	2.1	0.018	0.06
Disabled	-9.4 (-17 to -1.6)	4.0	0.029	0.02
Primary total joint replacement
Yes	Reference value
No	-5.3 (-9.6 to -1.0)	2.2	0.030	0.02

Adjusted R² = 0.23; that is, this combination of variables explains 23% of the variance in HOOS JR at baseline.