Table 1.

Description of the PICO of the systematic review

Serial number	PICO	Descriptions
1	Population	Studies conducted in clinical environments which may include: Acute care (inpatient and outpatient); Subacute care (rehabilitation centre); Community (general practice and aged care).
2	Intervention	Registry as an intervention with the following inclusion and exclusion criteria Inclusion criteria Studies will be included from the systematic review if they: Describe either a clinical registry or a CQR which collects data on a procedure, disease or healthcare resource; Collect data systematically and on an ongoing basis from the population being investigated; Provide feedback on the performance of a health system on an ongoing basis; Collect data from more than one hospital. Exclusion criteria Studies will be excluded from the systematic review if they: Collect and report on data from only one hospital; Do not provide feedback on an ongoing basis (such as an audit or point prevalence study); Are written in a language other than English; Were published prior to the start date on 1 January 1980 or after the end date of 31 December 2014 or were review articles.
3	Comparison	Comparators: Data collecting tools other than registry (population-based data, administrative data and medical record) to monitor health outcomes; Studies without a comparator will be included.
4	Outcome	The primary outcome measure is impact on survival/mortality. Secondary outcome measures reflect a process or outcome of healthcare, healthcare utilisation and costs.

CQR, clinical quality registry; PICO, population, intervention, comparison and outcome.