Clinical Review
Brief Interventions to Prevent Depression in Older Subjects: A Systematic Review of Feasibility and Effectiveness

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This systematic review proposed to explore the feasibility and effectiveness of brief interventions to prevent depression in older subjects. Computer databases were searched for potentially relevant articles published up until August, 2007. The bibliographies of relevant articles were searched for additional references and all the retrieved articles were screened to meet the following five inclusion criteria: original research, subjects mean age 40 years or more, controlled trial of a brief (<12 weeks) intervention to prevent depression, determination of depression status 6 months or more after enrolment, and use of an acceptable definition of depression. To examine feasibility, study enrolment, completion, and compliance rates were tabulated. To examine effectiveness, differences in depression symptom outcome scores or, when possible, absolute risk reductions (ARR) and relative risk reductions (RRR) for depression were tabulated. Fourteen trials were located. All were trials of brief psychosocial interventions. Many had one or more methodological limitations. Study enrolment rates were 21%–100% (median 45%–49%); completion rates were 53%–100% (median 85%); compliance rates were 29%–100% (median 80%). Eight trials had positive results. In three trials there were significant differences in depression symptom outcome scores favoring the intervention group; in eight trials, ARRs were −17% to 45% (median 6%); RRRs were −125% to 71% (median 33%). It seems that some types of brief psychosocial interventions have the potential to prevent depression in older subjects. Guidelines to improve the quality of future trials are proposed.

Section snippets

METHODS

The selection of articles involved three steps. First, three computer databases, MEDLINE, PsycINFO, and HealthStar, were searched for potentially relevant articles published from January 1966 to February 2005, January 1974 to February 2005, and January 1975 to February 2005, respectively. For MEDLINE and HealthStar, the keywords “depression” (exploded) and “prevention” were used; for PsychINFO, “depression” (exploded) and “primary mental health prevention” were used. To extend this exploration,

RESULTS

In all, the search strategy yielded 559 potentially relevant studies; 108 were retrieved for more detailed evaluation. Fourteen trials met the inclusion criteria. All were trials of brief psychosocial interventions. Ten23, 24, 25, 26, 27, 28, 29, 30, 31, 32 were trials of selective preventive interventions; 233, 34 were trials of indicated interventions; 235, 36 were trials of other types of interventions. The other 94 studies were excluded for the following reasons: 6 did not meet criterion 2,

DISCUSSION

We proposed to extend the exploration of the feasibility and effectiveness of brief interventions to prevent depression in older subjects and develop methodological guidelines to improve the quality of future studies of these types of interventions. We were able to locate 14 trials that met the study inclusion criteria. All were trials of psychosocial interventions. Most were trials of selective preventive interventions. Many had methodological limitations.

As for feasibility, many brief

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