Variables and definitions for data chartering
| Variable | Definition |
| First author | The last name of the paper’s first author |
| Year | The year the paper was published |
| Title | Title of the article |
| Journal | Name of the journal |
| Nationality | Nationality of the publisher or university |
| Country | Country or nationalities of the population |
| Sample size | The number of participants, informants or observations |
| Population | Group, sex and age |
| Method | Types of data and/or tools: qualitative (survey, interview, administrative data, observation and focus group) and quantitative (check list, self-report, chart reviews, electronic health record and validated questionnaire) |
| Results | The main results or findings |
| Other notes | Additional information about the paper |