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Front. Psychol. | doi: 10.3389/fpsyg.2019.00639

Deposit Limit Prompt in Online Gambling for Reducing Gambling Intensity: A Randomized Controlled Trial

 Ekaterina N. Ivanova1*, Kristoffer Magnusson2 and  Per Carlbring1
  • 1Stockholm University, Sweden
  • 2Karolinska Institutet (KI), Sweden

Pre-commitment tools - allowing users of gambling services to pre-set a limit for how much money they may spend - are relatively common. However, there exist no clear evidence of their effectiveness in preventing gamblers from spending more money than they otherwise planned. The aim of the study was to compare gambling intensity between users of an online gambling service prompted to set a deposit limit and non-prompted customers, both in the whole sample and among most active users based on the total number of gambling days. Prospective customers of a publicly governed gambling operator from Finland were randomized to receive a prompt to set a voluntary deposit limit of optional size either 1) at registration, 2) before or 3) after their first deposit, or 4) to an unprompted control condition. Data on customers from Finland with online slots as a preferred gambling category (N=4328) were tracked in the platform for 90 days starting at account registration, gambling intensity being measured with aggregated net loss. The intervention groups did not differ from each other in either proportion of participants with positive net loss or size of positive net loss. The pooled intervention group did not differ from the control group regarding proportion of gamblers with positive net loss (OR=1.0; p=.921) or size of net loss (B=-0.1; p=.291). The intervention groups had higher rates of limit-setters compared to the control condition (ORat-registration/pre-deposit/post-deposit = 11.9/9.2/4.1). Customers who have increased/removed a previously set deposit limit had higher net loss than the limit-setters who have not increased/removed their limit (Bat-registration/pre-deposit/post-deposit/control = 0.7/0.6/1.0/1.3), and unprompted limit-setters lost more than unprompted non-setters (B=1.0). Prompting online gamblers to set a voluntary deposit limit of optional size did not affect subsequent net loss compared to unprompted customers, motivating design and evaluation of alternative pre-commitment tools. Setting a deposit limit without a prompt or increasing/removing a previously set limit may be a marker of gambling problems and may be used to identify customers in need of help.

Keywords: problem gambling, Online gambling, Responsible gambling, deposit limit, pre-commitment, natural gambling environment, Consumer protection

Received: 30 Oct 2018; Accepted: 07 Mar 2019.

Edited by:

Changiz Mohiyeddini, Northeastern University, United States

Reviewed by:

Alex Blaszczynski, University of Sydney, Australia
Alex M. Russell, Central Queensland University, Australia  

Copyright: © 2019 Ivanova, Magnusson and Carlbring. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Ekaterina N. Ivanova, Stockholm University, Stockholm, Sweden,