title: Internet-based intervention to promote mental fitness in mildly depressed adults: design of a randomized controlled trial.
abstract: BACKGROUND
  Investing in mental well-being is considered a supplement to current mental health service delivery in which the treatment and prevention of mental disorders are core components. It may be possible for people to enhance their well-being by boosting their "mental fitness."
  
  
  OBJECTIVE
  Psyfit, an online, multi-component, fully automated self-help intervention, was developed with the aim of improving well-being and reducing depressive symptoms. The efficacy and cost-effectiveness of this intervention will be examined in a randomized controlled trial.
  
  
  METHODS
  In this two-armed randomized controlled trial, a total of 290 participants will be assigned to use Psyfit (experimental condition) or to a 6-month waiting list (control condition). Adults with mild to moderate depressive symptoms interested in improving their mental fitness will be recruited from the general population through advertisements on the Internet and in newspapers. Online measurements by self-assessment will be made prior to randomization (pre-test), 2 months after baseline (post-test), and 6 months after baseline (follow-up).
  
  
  RESULTS
  The primary outcome is well-being. Secondary outcomes are depressive symptoms, general health, vitality, and economic costs. Analysis will be conducted in accordance with the intention-to-treat principle.
  
  
  CONCLUSIONS
  This study will examine the efficacy and cost-effectiveness of an online intervention that aims to promote well-being in people with elevated levels of depressive symptoms. If shown to be effective, the intervention could prove to be an affordable and widely accessible intervention to improve well-being in the general population.
  
  
  BACKGROUND
  The study is registered with the Netherlands Trial Register, part of the Dutch Cochrane Centre (NTR2126).
authors.affiliation: Trimbos Institute, Netherlands Institute of Mental Health and Addiction, Innovation Centre of Mental Health and Technology, Utrecht, Netherlands. lbolier@trimbos.nl.
authors.forename: Linda
authors.initials: L
authors.lastname: Bolier
authors.forename: Merel
authors.initials: M
authors.lastname: Haverman
authors.forename: Jeannet
authors.initials: J
authors.lastname: Kramer
authors.forename: Brigitte
authors.initials: B
authors.lastname: Boon
authors.forename: Filip
authors.initials: F
authors.lastname: Smit
authors.forename: Heleen
authors.initials: H
authors.lastname: Riper
authors.forename: Ernst
authors.initials: E
authors.lastname: Bohlmeijer
keywords: Mental health; depression, well-being; happiness; preventive medicine; public health