Table 2.

Multiple linear regression analysis of knowledge test scores at 2 and 12 months follow-up as dependent variables and independent variables at baseline which correlated with knowledge test score at p < 0.2

	2 months			12 months
Independent variable 1	Beta	p	R2 change	Beta	p	R2 change
Allocation to education group	3.6	< 0.001	0.29	2.7	< 0.001	0.17
Formal educational level	1.1	< 0.001	0.06	1.2	< 0.001	0.07
GHQ-score at time of inclusion	- 0.1	< 0.001	0.08	- 0.2	< 0.001	0.12
Psychiatric disease at time of inclusion	- 1.6	0.01	0.02	- 1.5	0.02	0.02
R2 (adjusted) for the model	0.44			0.36

¹ Variables excluded in both models: Previous history of serious disease, esophagitis, having used PPI or H2-blocker, DSIQ sum-score, global QoL.