8. Thomson et al. (2007) UK

To determine the efficacy of a computerized decision aid compared to the standard use of clinical guidelines derived from the same decision analysis in patients with atrial fibrillation making a decision on whether take warfarin or aspirin therapy.

N = 109.

N = 56 intervention group,

N = 53 control group.

Exploratory trial

Fisher’s exact test for binary variables, x² tests and t test.

Although one arm was discontinued, it does not affect the validity of the comparison between the remaining arms.

9. Wetzels et al. (2005)

NETHERLANDS

To determine the effects of the program and to test the following hypotheses;

Implementation of the consultation leaflet would improve patients’ evaluations of their care.

Patients with underreported health problems would benefit from the intervention because they would be more likely to discuss these problems.

N = 171, intervention group,

N = 144, control group.

A cluster-randomized trial from different cohorts.

COMRADE,

PEI,

EUROPEP.

^*SPSS 11.0 and SAS (8.0) software.

Further research should focus on sub-groups of older patients, in combination with face-to-face interventions that stimulate involvement.