Dyadic-based targeted prevention of maladaptive co-rumination and internalizing problems and disorders in Dutch early adolescent girls: A Cluster Randomized Controlled Trial on the effectiveness of the blended school-based mindfulness prevention program Happy Friends, Positive Minds.

Dyadic-based targeted prevention of maladaptive co-rumination and internalizing problems and disorders in Dutch early adolescent girls: A Cluster Randomized Controlled Trial on the effectiveness of the blended school-based mindfulness prevention program Happy Friends, Positive Minds. - Prevention of maladaptive co-rumination and internalizing problems.

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

NL-OMON

Registry ID

NL-OMON55907

Enrollment

1000

Registered

2023-08-14

Start date

2023-08-14

Completion date

Unknown

Last updated

2025-09-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Internalizing symptoms and disorders (depression/anxiety)

Interventions

The Happy Friends, Positive Minds prevention program is designed to train social-emotional-behavioral self-regulation within the supportive close friendship context by facilitating dyadic as well as

Eligibility

Age

12 Years to 64 Years

Inclusion criteria

Inclusion criteria: To be eligible for inclusion, a participant/meisje must meet the following five inclusion criteria: (1) Aged 13 to age 15 years. (2) Visiting a secondary school of Samenwerkingsverband Koers VO. (3) Attending second or third grade of mainstream secondary education in academic year 2023/2024. (4) *Assigned female at birth, being a female transgender or being a nonbinary adolescent. (5) Having a mutual same gender (*assigned female at birth, being a female transgender or being a nonbinary adolescent) good or best friend at the same school. To be eligible for inclusion, a dyad must meet the following inclusion criterium: (1) At least one of the two girls of one friendship dyad, or both girls, should have a score of at least one standard deviation above the mean co-rumination screening score on the Co-rumination Questionnaire Short (Hankin et al., 2010).

Exclusion criteria

Exclusion criteria: Exclusion criteria at the school level (to mitigate any risk of difficulties in trial implementation): (1) Not having a headteacher in academic year 2023/2024. (2) Judged as 'inadequate* during most recent school inspection by the Dutch Inspectorate of Education. (3) Implementing another mindfulness-based intervention in academic year 2023/2024. Exclusion criterium at the individual girl level: (1) Following an/participating in an individual or group-based mindfulness-based training in academic year 2023/2024.

Design outcomes

Primary

Measure	Time frame
Participant-level self- and teacher-reported risk for (early onset) depression and anxiety, self-reported and observed co-rumination, self- and friend-reported friendship quality, self-reported positive and negative affect, self-reported interpersonal responses to positive affect and self-reported anhedonia symptoms will be the primary outcomes.	—

Secondary

Measure	Time frame
Secondary outcomes will be self-reported anhedonic symptoms, self-reported mastery, self-reported academic motivation, self-reported concentration, parent-reported health care use and teacher-reported emotional and behavioral problems and academic competence.	—

Countries

Netherlands

Outcome results

None listed

Source: NL-OMON (via WHO ICTRP)