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

Not Applicable

Not yet recruiting

• Conditions: Gambling Problem

• Registration Number: NCT07028450
• Lead Sponsor: University of Bergen

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 18-35 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).

Study Timeline

• Status Verified: 2025-06
• Study First Submitted: 2025-06-11
• Study First Submitted QC: 2025-06-11
• Last Update Submitted: 2025-06-11
• Study First Posted: 2025-06-19
• Last Update Posted: 2025-06-19
• Study Start: 2025-10-01
• Primary Completion: 2026-12-31
• Study Completion: 2026-12-31

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 192

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

• None

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Theoretical loss	Change 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 Outcome Measures

Name	Time	Method
Total stake	Change 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 call	Total amount of money staked
Loss percentage	Change 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

Trial Locations

Locations (1)

University of Bergen, Department of Psychosocial Science; 🇳🇴 Bergen, Vestland, Norway