Table 1.

Study inclusion and exclusion criteria.

Population	Older adults
Intervention	Inclusion: Organisational or systemic level of integration; Exclusion: interventions not consisting of pooled resources, interventions for hospitalised patients, interventions focusing on a single medical disease
Comparisons of interest	Comparison of no intervention i.e. usual care or comparison with baseline measures of the intervention group; Exclusion: Studies with no comparison
Outcomes	Any objective measure of hospital admission, length of hospital stay, hospital readmission, mortality, and subjective measure of patient satisfaction
Type of study	Inclusion: studies of any designs published between January 1995 to October 2018 written in English; Exclusion: Studies with no original data e.g. reviews, studies without an abstract