Replication Data and R Code for: Mixed-methods systematic review and multilevel meta-analysis reassessing AI conversational agents for mental health across architectures

This repository contains the replication dataset, reproducible R code, documentation, and verified Figure 3 outputs for the study Mixed-methods systematic review and multilevel meta-analysis reassessing AI conversational agents for mental health across architectures (PROSPERO CRD420261285571). Version 1.1.0 harmonised outcome classifications, added separately fitted specific-outcome analyses, implemented the final 16-variable candidate categorical-moderator set, corrected Figure 3 labels and counts, and added reproducibility documentation and session information. Version 1.1.1 distinguishes estimable but unreliable strata from non-poolable strata (single-study strata or k ≤ 2) and reports the post-exclusion architecture omnibus as a nominal CR2/HTZ sensitivity test outside the primary categorical-moderator BH-FDR family. Engagement analyses estimate aggregate study-level associations and not individual-level dose-response relations.