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Effects of Proactive Call to Customers of Norsk Rikstoto (Horse Gambling Operator in Norway): A Randomized Controlled Study

Effects of Proactive Calls: A Randomized Controlled Study

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07028450
Enrollment
195
Registered
2025-06-19
Start date
2026-02-16
Completion date
2026-12-31
Last updated
2026-05-11

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

Conditions

Gambling Problem

Keywords

Gambling Problem, Proactive calls, Randomized controlled trial, mini-intervention

Brief summary

Customers/gamblers gambling at Norsk Rikstoto (gambling monopolist in Norway providing horse gambling products with potential gambling problems will be randomly allocated to receive a proactive phone call (encouraging them to change their gambling behavior - e.g., be lowering the loss limit) or to a control condition. Outcomes will be short and long terms registered gambling behavior.

Detailed description

Norsk Rikstoto (gambling monopolist in Norway providing horse gambling products) enforces registered play, hence all gambling transactions and outcomes of stakes of all customers are registered and stored for 5 years. Based on daily algorithms high risk gamblers are identified. Gamblers 18-50 years who for at least 5 of the last 30 days have been identified as high risk gamblers will according to a 1.5:1 ratio be allocated to a proactive call condition or to a control condition. The call will be based on principles from motivating interviewing and will contain encouragements to alter gambling behavior (e.g., lowering loss limits). Primary outcome comprises theoretical loss (total bet x house advantage ((100% - payback%) / 100)). Secondary outcomes comprises total stakes made by the customer and loss percentage (proportion of stake that is lost). Baseline data comprises gambling behavior the 30 days before the call. Short-term effects comprise cumulative registered gambling behavior the first 90 days after the call whereas long-term effects consist of cumulative registered gambling behavior day 91-180 after the call. A random block design will be used where 15 eligible customers each week will be allocated either to the proactive call condition (n=9) or to the control condition (n=6).

Interventions

BEHAVIORALProactive call

The proactive call will be based on the principles of motivational interviewing. The content of the call comprises: 1) Asking the gambler/recipient to reflect on their gambling behavior, 2) providing to the gambler/recipient an overview of their gambling account and financial history, 3) offering to the gambler/recipient information about responsible gambling tools, such as setting lower limits, locking limits, taking a break, or self-exclusion, and 4) providing to the gambler/recipient information about relevant support services and the Gamban tool in cases where a need is expressed.

Sponsors

University of Bergen
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Subject)

Intervention model description

The two arms/conditions involves one proactive phone call or a control condition

Eligibility

Sex/Gender
ALL
Age
18 Years to 50 Years
Healthy volunteers
No

Inclusion criteria

* Being identified (based on an algorithm used by Norsk Rikstoto/the gambling provider) as a high risk gambler at least 5 of the last 30 days

Exclusion criteria

* Previously received a proactive call from Norsk Rikstoto

Design outcomes

Primary

MeasureTime frameDescription
Theoretical lossChange from baseline (30 days before the call) to day 1-90 after the call (short-term effect) and change from baseline (30 days before the call) to day 91-180 after the call (long-term effect).Total bet x house advantage ((100%-payback%) / 100)

Secondary

MeasureTime frameDescription
Total stakeChange from baseline (30 days before the call) to the first 90 days after the call (short term) and change from baseline to day 91-180 after the callTotal amount of money staked
Loss percentageChange from baseline (30 days before the call) to day 1-90 after the call (short-term effect) and change from baseline (30 days before the call) to day 91-180 after the call (long-term effect).Percentage of stakes that are lost

Countries

Norway

Contacts

CONTACTStåle Pallesen, PhD
staale.pallesen@uib.no+4792632099
CONTACTAndre Syvertsen, PhD
andre.syvertsen@uib.no+4795137908

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: May 12, 2026