Table 2 Data extraction variables

General study information

• Author

• Date of publication

• Country

• Study time period

• Other

Study design

• Prospective or retrospective cohort or RCT, non-randomised trial

Inclusion and exclusion criteria

• Population

• Sample size

• Patient characteristics (e.g. age, gender)

• Disease characteristics

Risk factors/Correlates

• Patient factors (comorbidities)

• Clinical (surgical, ASA score, medications)

• Hospital (tertiary/secondary, LOS, admission type, reason for initial hospital visit, ward type)

• Other

Primary outcome

• Re-presentation details

• Number of re-presentations

• Reason for re-presentations

• Re-presentation rate

• Time of re-presentations (time between initial hospital visit and re-presentation )

• Other

Patient outcome

• Complications

• Mortality

• Functional independence (FIM)

• Health-related quality of life (HRQOL)

Statistical analysis

• Analysis conducted

• Results reported