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.

Urnes et al. BMC Health Services Research 2008 8:236   doi:10.1186/1472-6963-8-236