title: HowNutsAreTheDutch (HoeGekIsNL): A crowdsourcing study of mental symptoms and strengths.
abstract: HowNutsAreTheDutch (Dutch: HoeGekIsNL) is a national crowdsourcing study designed to investigate multiple continuous mental health dimensions in a sample from the general population (n = 12,503). Its main objective is to create an empirically based representation of mental strengths and vulnerabilities, accounting for (i) dimensionality and heterogeneity, (ii) interactivity between symptoms and strengths, and (iii) intra-individual variability. To do so, HowNutsAreTheDutch (HND) makes use of an internet platform that allows participants to (a) compare themselves to other participants via cross-sectional questionnaires and (b) to monitor themselves three times a day for 30 days with an intensive longitudinal diary study via their smartphone. These data enable for personalized feedback to participants, a study of profiles of mental strengths and weaknesses, and zooming into the fine-grained level of dynamic relationships between variables over time. Measuring both psychiatric symptomatology and mental strengths and resources enables for an investigation of their interactions, which may underlie the wide variety of observed mental states in the population. The present paper describes the applied methods and technology, and presents the sample characteristics. Copyright © 2015 John Wiley & Sons, Ltd.
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Lian Van Der
authors.initials: LV
authors.lastname: Krieke
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Bertus F
authors.initials: BF
authors.lastname: Jeronimus
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.|University of Groningen, Johann Bernoulli Institute for Mathematics and Computer Science, Distributed Systems Group, Groningen, The Netherlands.
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Blaauw
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Rob B K
authors.initials: RB
authors.lastname: Wanders
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Ando C
authors.initials: AC
authors.lastname: Emerencia
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Hendrika M
authors.initials: HM
authors.lastname: Schenk
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Stijn De
authors.initials: SD
authors.lastname: Vos
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Evelien
authors.initials: E
authors.lastname: Snippe
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Marieke
authors.initials: M
authors.lastname: Wichers
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Johanna T W
authors.initials: JT
authors.lastname: Wigman
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Elisabeth H
authors.initials: EH
authors.lastname: Bos
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Klaas J
authors.initials: KJ
authors.lastname: Wardenaar
authors.affiliation: University of Groningen, University Medical Center Groningen, Department of Psychiatry, Interdisciplinary Center Psychopathology and Emotion regulation (ICPE), Groningen, The Netherlands.
authors.forename: Peter De
authors.initials: PD
authors.lastname: Jonge
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D063045:Crowdsourcing / Q000706:statistics & numerical data*; D006801:Humans; D020407:Internet; D008137:Longitudinal Studies; D001523:Mental Disorders / Q000175:diagnosis*; D008603:Mental Health / Q000706:statistics & numerical data*; D011795:Surveys and Questionnaires
keywords: crowdsourcing; ecological momentary assessment; longitudinal; mental strengths and resources; mental symptoms