Major depression and its correlates in primary care settings in six countries: 9-Month follow-up study

Abstract

Background: Few published studies address depression outcomes in primary care from a cross-cultural perspective. Aims: To define baseline factors associated with 9-month clinical outcomes across six countries. Method: Adults meeting criteria for current major depression were recruited from primary care clinics in Australia, Brazil, Israel, Spain, Russia and the USA; 968 patients were assessed at the 9-month follow-up. Predictors of complete remission were examined using logistic regression with a hierarchical model. Results: Rates of complete remission in the six sites ranged from 25% to 48%. Logistic regression using pooled data showed that education, key life events and the Quality of Life Depression Scale score at baseline were the final predictors of complete remission, adjusting for centres, socio-demographic data, severity of depression, comorbidity and general quality of life. Variation in predictors across sites was not statistically significant. Conclusions: The two major findings of this study were the low proportion of people achieving complete remission at follow-up across the six sites, and that some baseline characteristics (education, Quality of Life Depression Scale score and key life events) are modest predictors of outcome in depression.