Table 3 reflects the ACHIEVE intervention characteristics for participants randomized to the intervention group.
Broadly, this may include such things as participant characteristics (for example, age, gender), intervention characteristics (for example, length, frequency, intensity, duration, mode) and outcome assessment methods (for example, type of instrument used to assess depression).
The secondary question is: Which participant and intervention characteristics of self-management support interventions for informal caregivers of people with dementia are associated with larger effects?
For each study we intended to describe the setting, theoretical basis for the intervention, characteristics, and outcomes.
The present study provides an overview of universal and targeted programmes, while distinguishing four age groups and examining which intervention characteristics are the effective components for the respective groups.
The domains were based on the Consolidated Framework for Implementation Research (intervention characteristics, outer setting, inner setting, characteristics of individuals, and process) [ 13 ].
The following intervention characteristics were extracted: theories used for intervention development, variables used to tailor the computer-tailored information, the "tool" that was used to provide individual feedback, frequency of tailored feedback, and additional health education activities.
In terms of intervention characteristics, the distribution of evidence for effects on selection and consumption of food was skewed towards pairwise comparisons in which the difference in relative size of the portions, packages, individual units or tableware was large.
Our inclusion criteria and coding frame have parallels with other frameworks for describing intervention characteristics, such as ASTOR (aim, setting, target, objectives, resources), originally developed to describe and map HIV health promotion activity[ 12], and PICO(C) (population, intervention, comparison, outcomes, context) used in systematic reviews[ 18].
We extracted data on the following: patient characteristics (including age, sex, indication for parenteral access); intervention characteristics (including description of parenteral routes, use of PPE); trial methods (specifically information for 'Risk of bias' assessment); outcome data.
