Table 2.

Overview of outcomes and the registries used to extract data

Outcomes:	Registers				Description of outcome
	NPR	NHI	DRG-DAGS	DR
Primary care
GP contacts		x			Number of contacts with GPs (ordinary consultations, home visits, telephone and email consultations)
GP costs		x			Healthcare costs of GPs
Other specialist MD costs		x			Healthcare costs of specialised medical doctors in primary care (excl. GPs and dentists)
Psychologist costs		x			Healthcare costs of psychologists in primary care
Physiotherapist costs		x			Healthcare costs of physiotherapists in primary care
Prescription drug costs				x	Costs of prescription drugs
Secondary care
Hospitalisation days	x				Days in hospital, not as outpatient
Outpatient visits	x				Number of visits to outpatient clinic
Emergency room contacts	x				Number of out-of-hours contacts with GPs and all contacts with emergency rooms.
Surgical procedures	x				Number of surgical procedures in hospital
Non-surgical procedures	x				Number of non-surgical procedures and techniques in hospital.
Total costs		x	x		Total healthcare costs in primary and secondary sectors excluding costs in the psychiatric secondary sector.
	Plus the price of CT scans in the study setting: EUR 238/CT scan including recruitment of participants and staff salaries.

DR, Drug Registry; DRG-DAGS, Diagnostic Related Groups-Diagnostic Outpatient Group System Registries; GP, general practitioner; MD, medical doctor; NHI, National Health Insurance Registry; NPR, National Patient Registry.