Observed components of selection criteria. Selection criteria that we applied in sources about gabapentin (a) and quetiapine (b). Shown are all possible combinations of selection criteria. Each of the three rings of the circle represents a different component of the selection criteria: numerical threshold, participant group, and difference in frequency threshold. Green text indicates selection criteria reported in public sources. All = all participants combined across groups; Any group = participants in a particular intervention group; Active = participants in the active intervention group (i.e., gabapentin or quetiapine).