- ICH GCP
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- Klinische proef NCT07585357
Adaptive Mobile Interventions to Reduce Cancer Risk Behaviors
Tobacco use remains the leading cause of preventable death, causing over 400,000 annual deaths in the United States alone. Smartphone-based interventions, particularly those leveraging real-time adaptive messaging, represent a promising yet underutilized approach to delivering personalized tobacco and cannabis treatment. The investigator's ongoing NCI funded micro-randomized trial (MRT; R01 CA246590) has shown initial feasibility in reducing smoking urges through situationally tailored cognitive-behavioral therapy (CBT) and mindfulness-based acceptance and commitment-based therapy (ACT) messages triggered by real-time contextual data (e.g., geolocation, momentary stress). To advance from a static MRT framework to a dynamic, data-driven just-in-time adaptive intervention (JITAI), this project aims to develop, test, and refine a reinforcement learning (RL) algorithm that can continuously adapt to user needs in real-time, enhancing treatment outcomes for various tobacco and cannabis products.
To ensure optimal usability and engagement, the investigators will conduct user-centered testing with the developed RL-based intervention delivery in one cohort (N=7) over 45 days. This will include usability assessment via the System Usability Scale, analysis of app interaction metrics, and semi-structured interviews to gather feedback for refining message content, timing, and design.
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
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Maryland
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Baltimore, Maryland, Verenigde Staten, 21205
- Johns Hopkins Bloomberg School of Public Health
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
- Volwassen
Accepteert gezonde vrijwilligers
Beschrijving
Inclusion Criteria:
- live in the U.S.;
- are between 18 and 40 years of age;
- own a smartphone with iOS and Android operating system and GPS capabilities;
- are carrying smartphone every day;
- are willing to participate in the study for 44 days and give the research team access to the phone GPS data;
- have smoked ≥100 cigarettes in the participant's life and currently smoke at least 3 cigarettes per day on 5 or more days of the week;
- are planning to quit smoking within the next 30 days.
Exclusion Criteria:
- None
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Behandeling
- Toewijzing: NVT
- Interventioneel model: Opdracht voor een enkele groep
- Masker: Geen (open label)
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Experimenteel: RL-informed intervention
Participants complete a 14-day Ecological Momentary Assessment (EMA) training phase using a smartphone app (MetricWire), during which the participant responds to up to 3 randomly prompted and cigarette-triggered EMA surveys per day while the app passively collects GPS data.
These data are used to identify high-risk locations and time periods and to inform a previously trained reinforcement learning (RL) algorithm.
During the subsequent 30-day intervention phase, the RL algorithm delivers personalized intervention messages (cognitive-behavioral therapy [CBT], acceptance and commitment therapy [ACT], or attention control) triggered by geofence entry at high-risk locations.
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Intervention messages will suggest strategies of coping with smoking urges in the moment.
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Change in smoking urge as assessed by a single item
Tijdsspanne: 15 minutes after message delivery
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The primary outcome will be change in participants' rating of smoking urge in EMA-post surveys, prompted 15 minutes after intervention message delivery, and controlling for the ratings in EMA-pre surveys.
Urge will be assessed by a single item on a 5-point scale, ranging from 1-5; (1-very low, to 5-very high).
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15 minutes after message delivery
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Change in cigarettes smoked per day in past week as assessed by a single item
Tijdsspanne: Baseline, 45-day follow-up
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The primary outcome will be change in self-reported number of cigarettes smoked per day in the past week from baseline to 45-day follow-up.
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Baseline, 45-day follow-up
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System Usability as assessed by the System Usability Scale (SUS)
Tijdsspanne: 45-day follow-up
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The primary outcome will be assessment of the intervention app usability assessed by a slightly modified version of the 10-item System Usability Scale ("system" wording changed to "app").
Each item is assessed on a 5-point scale from 1 (strongly disagree) to 5 (strongly agree).
The SUS total score ranges from 0-100, with higher scores indicating greater usability.
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45-day follow-up
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Ander gebruik van tabaksproducten sinds de aflevering van het interventiebericht, beoordeeld aan de hand van een enkel item
Tijdsspanne: 15 minuten na bezorging van het bericht
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Ander gebruik van tabaksproducten, waaronder het gebruik van e-sigaretten, in de 15 minuten na de bezorging van het bericht, wordt beoordeeld aan de hand van een enkel item op een binaire antwoordschaal (ja/nee).
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15 minuten na bezorging van het bericht
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Voltooiing van activiteit zoals beoordeeld door een enkel item
Tijdsspanne: 15 minuten na bezorging van het bericht
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Zelfgerapporteerde voltooiing van interventieberichtaanbeveling in EMA-post-enquêtes, gevraagd 15 minuten na aflevering van interventiebericht, wordt beoordeeld door een enkel item op een binaire antwoordschaal (ja/nee).
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15 minuten na bezorging van het bericht
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Zelfgerapporteerde 7-daagse puntprevalentie abstinentie zoals beoordeeld door een enkel item
Tijdsspanne: 45 dagen follow-up
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Zelfgerapporteerde 7-daagse puntprevalentie onthouding (niet roken, zelfs geen trekje) zal worden beoordeeld door een enkel item op een binaire responsschaal (ja/nee).
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45 dagen follow-up
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Smoking since intervention message delivery as assessed by a single item
Tijdsspanne: 15 minutes after message delivery
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Smoking in the 15 minutes after message delivery will be assessed by a single item on a binary response scale (yes/no).
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15 minutes after message delivery
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Change in stress as assessed by a single item
Tijdsspanne: 15 minutes after message delivery
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Change in rating of stress in EMA-post surveys, prompted 15 minutes after intervention message delivery, and controlling for the ratings in EMA-pre surveys.
Stress will be assessed by a single item on a 5-point scale ranging from 1-5 (1-very low, to 5-very high).
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15 minutes after message delivery
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Change in negative affect as assessed by a single item
Tijdsspanne: 15 minutes after message delivery
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Change in rating of negative affect in EMA-post surveys, prompted 15 minutes after intervention message delivery, and controlling for the ratings in EMA-pre surveys.
Negative affect will be assessed by a single item on a 5-point scale ranging from 1-5 (1-very low, to 5-very high).
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15 minutes after message delivery
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Message helpfulness as assessed by a single item
Tijdsspanne: 15 minutes after message delivery
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Rating of message helpfulness in EMA-post surveys, prompted 15 minutes after intervention message delivery.
This will be assessed by a single item on a 5-point scale ranging from 1-5 (1-not at all helpful, to 5-extremely helpful).
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15 minutes after message delivery
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Change in cigarettes smoked as assessed by a single item
Tijdsspanne: Baseline, 45-day follow-up
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Change (reduction) in cigarettes smoked by at least 50% between baseline and 45-day follow-up.
Reduction will be calculated based on self-reported number of cigarettes/day in the past week.
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Baseline, 45-day follow-up
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Tobacco quit attempt as a assessed by a single item
Tijdsspanne: 45-day follow-up
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A tobacco quit attempt since the baseline assessment will be assessed by a single item on a binary response scale (yes/no).
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45-day follow-up
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Change in frequency and intensity of smoking urges as assessed by two items of the Mood and Physical Symptoms Scale (MPSS)
Tijdsspanne: Baseline, 45-day follow-up
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Change in frequency and intensity of smoking urges will be assessed by two craving items from the Assessed with the Mood and Physical Symptoms Scale (MPSS) - subscale MPSS(C).
Both items will be assessed on a 6-point scale from 0 (not at all / no urges) to 5 (all the time / extremely strong).
Score range 0-10.
Lower score better.
Both items will be combined into the MPSS(C) subscale for analysis.
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Baseline, 45-day follow-up
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Change in psychological flexibility as assessed by the CompACT-15
Tijdsspanne: Baseline, 45-day follow-up
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Change in psychological flexibility from baseline to 45-day follow-up will be assessed by the CompACT-15.
The CompACT-15 total score ranges from 0-90, with higher scores indicating better psychological flexibility.
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Baseline, 45-day follow-up
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Change in smoking-specific experiential avoidance as assessed by the Avoidance and Inflexibility Scale (AIS)
Tijdsspanne: Baseline, 45-day follow-up
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Change in smoking-specific experiential avoidance from baseline to 45-day follow-up will be assessed by the Avoidance and Inflexibility Scale (AIS).
Items are scored on a scale of 1-5 and combined into a total score.
Score range 13-65, higher total score indicates a more avoidant and inflexible response to internal states associated with smoking.
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Baseline, 45-day follow-up
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Tobacco product switching as assessed by 5 questions
Tijdsspanne: Baseline, 45-day follow-up
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Switching to other tobacco products including e-cigarettes from baseline to 45-day follow-up will be assessed using questions about past 7-day use of cigarettes, e-cigarettes, cigars / cigarillos / little cigars, smokeless tobacco, and hookah / waterpipe.
Participants will be coded as having switched if the participant does not report cigarette smoking, but use of another tobacco product at a follow-up assessment.
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Baseline, 45-day follow-up
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Medewerkers en onderzoekers
Medewerkers
Onderzoekers
- Hoofdonderzoeker: Johannes Thrul, PhD, Johns Hopkins Bloomberg School of Public Health
Studie record data
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Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
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Meer informatie
Termen gerelateerd aan deze studie
Aanvullende relevante MeSH-voorwaarden
Andere studie-ID-nummers
- IRB00033759
Plan Individuele Deelnemersgegevens (IPD)
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Beschrijving IPD-plan
IPD delen Ondersteunend informatietype
- LEERPROTOCOOL
- ANALYTIC_CODE
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