Three positive psychology interventions (coping humor, three funny things, three good things) were compared with a placebo control condition (early memories) in a randomized placebo-controlled online trial. A total of 182 healthy participants participated in a one week web-based diary study and completed evaluation measures at pre, post, and one month follow-up. They were recruited via e-mail and have been primarily students. Primary outcomes have been happiness and depressive symptoms, secondary outcomes coping humor, cheerfulness (and its subscales), and subjective perceived change. The intention-to-treat analysis (ITT) using linear mixed models could not replicate the positive effects of past research. When compared to the control condition, only the coping humor intervention influenced primary outcomes (r = 0.24–0.29). Three funny things and three good things had no effects at all. Secondary outcomes showed only isolated effects, so that no uniform effect pattern was found for the interventions. Reasons for the small effects, such as motivation and psychosocial status of the participants, as well as recommendations for future studies are discussed.

中文翻译：

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使用在线日记的三种积极的心理干预措施的效果：一项随机安慰剂对照试验。

在一项随机的安慰剂对照在线试验中，将三种积极的心理干预（应对幽默，三个有趣的事情，三个美好的事情）与安慰剂对照的情况（早期记忆）进行了比较。共有182名健康参与者参加了为期一周的基于网络的日记研究，并在前后，一个月和一个月的随访中完成了评估措施。他们是通过电子邮件招募的，主要是学生。主要结果是幸福和抑郁症状，应对幽默，快乐（及其分量表）和主观感知变化的次要结果。使用线性混合模型进行的意向治疗分析（ITT）无法复制过去研究的积极影响。与对照组相比，只有应付幽默干预会影响主要结局（r = 0.24-0.29）。三个有趣的事情和三个好的事情根本没有效果。次要结果显示仅是孤立的影响，因此没有发现干预的统一影响模式。讨论了影响较小的原因，例如参与者的动机和社会心理状况，以及对未来研究的建议。