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Table 2 Inclusion and exclusion criteria and underlying rationale

From: CANreduce-SP—adding psychological support to web-based adherence-focused guided self-help for cannabis users: study protocol for a three-arm randomized control trial

Inclusion criteria

Reasoning

Informed consent via the Webform

To ensure adequate knowledge of the procedures and declare their consent

Minimal age of 18 years

To ensure a minimum age of participation

Cannabis use at least once weekly over the last 30 days

To include participants with less than daily cannabis use, increase the validity of results

At least once-weekly Internet access and a valid e-mail address

To ensure at least some access to the intervention

Good command of the Spanish language

To ensure that participants will be able to understand the information provided

Exclusion criteria

Reasoning

Participation in other psychosocial or pharmacological treatments for the reduction or cessation of cannabis use

To avoid confounding treatment effects

Current pharmacologically-treated psychiatric disease or any history of psychosis, schizophrenia, bipolar type I, substance use disorder, or significant current suicidal or homicidal thoughts

To avoid having subjects with these problems enter the study, since they could hinder the treatment’s effectiveness