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Background: Various models of intervention for caregivers of patients with dementia have been described. There has been little direct comparison of cultural differences between countries and the effect any differences may exert on the outcome of caregiver interventions. Aims: The aims of the three-country study (USA, Australia and the UK) were to assess whether caregiver interventions can still be successful when anti-dementia drugs are provided to patients, and whether a caregiver intervention can be successfully implemented using the same methods in three different English-speaking countries. In this paper, the cultural differences and similarities between the three countries are examined. Method: Randomised, controlled trial involving 158 patients and their caregivers (divided equally across three centres, New York, Sydney and Manchester) with all the patients receiving donepezil and the caregivers randomised to a caregiver intervention or treatment as usual. Results: There were few differences between countries in the main outcome measures, and no differences between the treatment-as-usual group and the intervention, but interesting cultural nuances were observed between groups. Despite these differences, the caregiver intervention was associated with positive results on caregiver depression across all the countries. Conclusions: This first multinational carer intervention study has emphasised the similarities between the three countries whilst highlighting crucial differences which may be important when planning cross-cultural studies in the future. The positive results achieved on caregiver depression were replicated across the three centres. Copyright © 2010 S. Karger AG, Basel [ABSTRACT FROM AUTHOR]