CBT for CUD: Meta-analysis data

Description

The data is stored in an MS Excel file and has been processed in SPSS v28.0, with further analysis conducted using STATA 18 for ease. The dataset includes study-level variables such as study ID, country, and setting, along with participant demographics like sample size, age, and gender distribution. It also details the intervention, including the number of CBT sessions and the type of CBT used, and compares it against other interventions such as psychosocial treatments, contingency management, and treatment as usual. The primary outcome measure is cannabis use frequency, reported as mean percentages over past days at short-, medium-, and long-term follow-ups. The dataset includes sample sizes, mean frequencies, and standard deviations for both the CBT and comparison groups at each time point. This data can be interpreted for individual studies or used for meta-analysis, making it a valuable resource for assessing the effectiveness of CBT in reducing cannabis use over time.

Steps to reproduce

The data was extracted from articles included in a systematic review published elsewhere, with cannabis use frequency defined as the percentage of days cannabis was used within the past 30 days. Since studies reported this outcome over different time frames (30, 60, or 90 days), standardization was necessary. The reported means were adjusted to a 30-day period using a proportional method, while the standard deviations (SDs) were standardized using a square root transformation to account for variability over time. Missing follow-up sample sizes were imputed based on baseline values unless significant dropout was indicated. Follow-ups were categorized into short-term (≤4 months), medium-term (6–9 months), and long-term (≥12 months). Cannabis consumption data, reported in different units such as joints, waterpipes, or grams per day, was standardized for consistency. One joint was considered equivalent to 0.32 grams of cannabis, and waterpipe use was converted based on a ratio of 1 joint to 3 waterpipes. Directly reported grams per day values were used without conversion. This rigorous standardization ensured consistency across studies, facilitating meaningful comparisons and enabling meta-analysis.

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