Table 5.

Adjusted analyses: model effects. GZLM Generalised linear models, GEE generalised estimating equations

Year (analysis)	0 (GZLM)	1 (GZLM)	2 (GZLM)	0–1–2 (GEE)
Independent variables	P-valuea	P-value	P-value	P-value
Intercept	<0.001	<0.001	<0.001	<0.001
Patient group (1, 2 or 3)	<0.001	0.019	0.400	0.004
SF-36 Physical Component Summary at baseline	<0.001	<0.001	<0.001	<0.001
Disease severity at baseline	0.031	0.016	<0.001	<0.001
SF-36 Health Change at baseline	0.009	0.763	0.098	0.196
Chronic Disease Score	0.015	0.657	0.497	0.458
Gender	0.031	0.818	0.468	0.209
Engagement in economic activity	0.043	0.275	0.098	0.070
Living in former German Democratic Republic	0.135	0.504	0.436	0.500
Disease duration	0.665	0.501	0.839	0.960
Age	0.842	0.946	0.888	0.866
Education	0.869	0.615	0.141	0.364

^a P-values are based on Wald chi-square statistics and indicate if the variable is a significant predictor in the model