Table 4.

Wald tests for fixed effects (N = 12,663)

Fixed term	Wald statistic	d.f.	Wald/df.	χ2 prob.
Sequentially adding terms to fixed model
Mobility	9772.4	2	4886.2	<0.001
Self care	2070.1	2	1035.1	<0.001
Usual activities	426.1	2	213.0	<0.001
Pain/discomfort	2338.0	2	1169.0	<0.001
Anxiety/depression	544.7	2	272.3	<0.001
Dropping individual terms from full fixed model
Mobility	544.7	2	272.4	<0.001
Self care	674.0	2	337.0	<0.001
Usual activities	253.2	2	126.6	<0.001
Pain/discomfort	1789.0	2	894.5	<0.001
Anxiety/depression	544.7	2	272.3	<0.001