Table 1.

Overview of data sources.

Name of register	Type of data	National/Local	Holder of register
RAY	Indications, outcome, and therapy-specific data on invasive neurostimulation treatments	Local	Uppsala University Hospital
The national patient register (NPR)	Diagnoses and procedures in inpatient and outpatient care in Sweden	National	The Swedish Board of Health and Welfare
The register of the total population (RTP)	Demographic and socioeconomic data	National	Statistics Sweden
The cause of death register	Cause of all deaths	National	The Swedish Board of Health and Welfare
Prescribed drug register (PDR)	Prescribed pharmaceutical products	National	The Swedish Board of Health and Welfare
The LISA Register	Labor market and educational level data	National	Statistics Sweden
Data from the Swedish Social insurance Agency	Work status and sick leave	National	The Swedish Social insurance Agency
SWESPINE	Outcome and procedural data on spine surgery	National	The Swedish Association of Spine surgeons

See supplemental data, available at http://links.lww.com/PR9/A210 for a further description of individual data sources.

LISA, national register on labor market and educational level data; RAY, a local registry on invasive neurostimulation treatments for pain; SWESPINE, the national register on spine surgery.