Positive Psychology Interventions Addressing Pleasure, Engagement, Meaning, Positive Relationships, and Accomplishment Increase Well-Being and Ameliorate Depressive Symptoms: A Randomized, Placebo-Controlled Online Study.

In two conditions (i.e., pleasure, and accomplishment) the positive effects on happiness were observable up to 6 months after the intervention, whereas in the positive relationships condition the effects failed to reach significance.

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Overall, most conditions also led to a reduction in depressive symptoms; the exceptions were the engagement and the accomplishment conditions that yielded marginally significant results.

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