Skip to content

Comparing the Effects of Indoor vs. Outdoor Horticultural Therapy on College Students

Comparing the Effects of Indoor vs. Outdoor Horticultural Therapy on College Students

Status
Active, not recruiting
Phases
NA
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT06950801
Enrollment
120
Registered
2025-04-30
Start date
2025-03-20
Completion date
2026-06-01
Last updated
2025-04-30

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

Conditions

Healthy

Brief summary

This study used a randomised controlled trial to investigate the effects of different forms of horticultural group interventions on college students' depression, anxiety and subjective well-being, and the internal mechanisms of the effects. Participants are required to complete the following tasks: Attend one indoor/outdoor group gardening activity per week, lasting 2 hours each session, for a total of 8 weeks. Complete psychological scale assessments at five time points: before the activity begins, at 4 weeks after the start, upon completion of the activity, and at 1 week and 2 weeks after completion.

Interventions

BEHAVIORALoutdoor-horticultural therapy

Students are randomly assigned to the Outdoor Horticultural Therapy group, where they will receive outdoor horticultural therapy for eight weeks

BEHAVIORALindoor-Horticultural Therapy group

Students are randomly assigned to the indoor horticultural therapy group, where they will receive indoor horticultural therapy for 8 weeks

BEHAVIORALGeneral Psychological Group Counselling Team

Students were randomly assigned to general group groups to participate in an 8-week mental health group activity

Sponsors

Ye Zhiyin
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
DOUBLE (Subject, Caregiver)

Eligibility

Sex/Gender
ALL
Healthy volunteers
Yes

Inclusion criteria

\- University students

Exclusion criteria

* Diagnosed with a mental disorder

Design outcomes

Primary

MeasureTime frameDescription
DepressionFrom enrollment to 2 weeks after the completion of the 8-week treatment Edit Copy OutcomeThe Patient Health Questionnaire 9-item (PHQ-9): This scale consists of 9 items, each rated on a 4-point Likert scale, with higher scores indicating more severe depressive symptoms in the subject.
AnxietyFrom enrollment to 2 weeks after the completion of the 8-week treatmentGeneralized Anxiety Disorder 7-item Scale (GAD-7): This scale consists of 7 items, each rated on a 4-point Likert scale, with higher scores indicating more severe anxiety symptoms in the subjects.
Positive And Negative AffectiveFrom enrollment to 2 weeks after the completion of the 8-week treatmentPositive and Negative Affect Schedule (PANAS): This scale consists of 20 items, including 10 positive affect items and 10 negative affect items, with each item rated on a Likert five-point scale. Higher scores on the positive affect items indicate higher levels of positive affect in the participants, while higher scores on the negative affect items indicate higher levels of negative affect in the participants.
Life satisfactionFrom enrollment to 2 weeks after the completion of the 8-week treatmentThe Satisfaction With Life Scale (SWLS): This scale consists of 5 items, each rated on a 7-point Likert scale, with higher scores indicating greater life satisfaction among participants.

Secondary

MeasureTime frameDescription
Self-conceptFrom enrollment to 2 weeks after the completion of the 8-week treatmentSense of Mastery Scale, SMS. This scale consists of 12 items, with each item rated on a five-point Likert scale. Higher scores indicate a clearer self-concept among the participants.
meaning in lifeFrom enrollment to 2 weeks after the completion of the 8-week treatmentThe Meaning in Life Questionnaire (MLQ): This scale consists of 10 items with two dimensions: Presence of Meaning (MLQ-P) and Search for Meaning (MLQ-S). Each item adopts a 7-point Likert scale, with higher scores indicating that participants experience a stronger sense of meaning in life.
ResilienceFrom enrollment to 2 weeks after the completion of the 8-week treatmentThe Connor-Davidson Resilience Scale (CD-RISC): The scale consists of 25 items divided into three dimensions-tenacity, self-reliance, and optimism. Each item is rated on a Likert five-point scale. Higher scores indicate greater psychological resilience in the subjects.
nature connectionFrom enrollment to 2 weeks after the completion of the 8-week treatmentThe Nature Connection Scale, which consists of 14 items, employs a 5-point Likert scale for each item, with higher scores indicating that participants perceive themselves as more closely connected to nature.
GritFrom enrollment to 2 weeks after the completion of the 8-week treatmentThe Grit Scale consists of 12 items with two dimensions: the Effort dimension and the Interest Consistency dimension. Each item is rated on a five-point Likert scale, with higher scores indicating that participants perceive themselves as more perseverant.
LonelinessFrom enrollment to 2 weeks after the completion of the 8-week treatmentUCLA Loneliness Scale: This scale consists of 8 items, each rated on a 5-point Likert scale, with higher scores indicating stronger feelings of loneliness in the subjects.
Sense of controlFrom enrollment to 2 weeks after the completion of the 8-week treatmentSense of Mastery Scale (SMS): This scale consists of 7 items, each using a 5-point Likert scale, with higher scores indicating a stronger sense of mastery in the subjects.
AvoidanceFrom enrollment to 2 weeks after the completion of the 8-week treatmentThe Brief Experiential Avoidance Questionnaire (BEAQ) was initially simplified and revised by Gámez et al. based on the Multidimensional Experiential Avoidance Questionnaire to assess content related to experiential avoidance. Cao et al. conducted a Chinese version revision in 2021. The questionnaire consists of 15 items, with the cognitive avoidance dimension containing 8 items and the behavioral avoidance dimension containing 7 items, all rated on a 6-point scale from Strongly Disagree to Strongly Agree.

Countries

China

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026