1. Effects of a waiting list control design on alcohol consumption among online help-seekers: A randomised controlled trial.
- Author
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Ulfsdotter Gunnarsson, Katarina, Henriksson, Martin, McCambridge, Jim, and Bendtsen, Marcus
- Subjects
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ALCOHOL drinking , *RANDOMIZED controlled trials , *BEHAVIORAL research , *LEGAL evidence , *CONTROL groups - Abstract
Indirect evidence suggests that using waiting list control designs in behavioural research may have unintended consequences. The aim of this study was to estimate the effects of a waiting list design on alcohol consumption among individuals who had looked online for help. A two-arm randomised controlled trial was employed. The intervention group was informed that they belonged to the intervention group and would receive immediate access to a digital alcohol intervention. The waiting list control group was informed that they belonged to the group that had to wait four weeks to be given access to the intervention and in the meantime, they would be given a summary of their drinking. However, both groups received immediate access to the same digital alcohol intervention; the experimental contrast was thus between being told to wait or not. We randomised 3388 participants (intervention: 1692, waiting list: 1696). Data were available for 954 participants at 1-month follow-up. We found no strong evidence that alcohol consumption differed between groups, but the evidence pointed towards the intervention group reporting lowering weekly alcohol consumption compared to the waiting list control group (IRR = 0.95, 95 % CI = 0.83; 1.08, probability of effect = 78.8 %). We found no strong evidence that being informed that access to an intervention would be delayed produced differential self-reported alcohol consumption compared to being informed that access would be immediate. We did find a difference in engagement with the intervention materials, indicating that the experimental manipulation was successful. • Direct evidence of the effects of using a waiting list control condition is scarce. • This randomised controlled trial estimated the effects of a waiting list design. • No strong evidence a waiting list design altered self-reported alcohol consumption. • The waiting list group nonetheless reported somewhat higher alcohol consumption. • Further study of waiting lists as control conditions is needed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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