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Table 1 Overall description of data sources and study period

From: Lactic acidosis associated with metformin in patients with moderate to severe chronic kidney disease: study protocol for a multicenter population-based case-control study using health databases

Database/Hospital

Catalonia

Madrid

Bellvitge University Hospital

Hospital Germans Trias i Pujol

Hospital Clinic of Barcelona

University Hospital Vall d’Hebron

Hospital de la Santa Creu i Sant Pau

SIDIAP

Hospital Clínico San Carlos

Ramón y Cajal University Hospital

Fundación Jiménez Díaz University Hospital

Gerencia de Atención Primaria

Population covered (inhabitants)

373.000

810.000

540.000

450.000

403.000

N/A

366.000

574.000

424.000

N/A

Database type (Electronic medical register)

Hospital

Data available

+

+

+

+

+

N/A

+

+

+

N/A

Clinical data

DW

Hospital DW

Hospital DW

Hospital DW

Hospital DW

N/A

Hospital DW

CMBD

Hospital DW

N/A

Laboratory data

DW

Hospital DW

ServoLab

Modulab, clinical records

Openlab

N/A

Laboratory database

Openlab

Hospital DW

N/A

Primary care

Data available

+

N/A

N/A

N/A

N/A

+

N/A

N/A

N/A

+

Clinical data

DW

N/A

N/A

N/A

N/A

ECAP

N/A

N/A

N/A

Ap-Madrid

Laboratory data

DW

N/A

N/A

N/A

N/A

ECAP

N/A

N/A

N/A

Ap-Madrid

Starting year of electronic data collection

2010

2008

2003

2009

2011

2006

2009

2009

2009

2002

Study period

April 2011–December 2016

January 2014–December 2016

January 2010–December 2016

January 2010–December 2016

January 2012–December 2016

January 2010–December 2016

January 2010–December 2015

January 2010–December 2015

January 2010–December 2016

January 2010–December 2016

Disease and procedure coding system

ICD 9

ICD 9

ICD 9

ICD 9

ICD 9

ICD 10

ICD 9

ICD 9

ICD 9

ICPC-2

Hospital admission and discharge data available

Yes

Yes

Yes

Yes

Yes

No

Yes

Yes

Yes

No

Drug dictionary code

WHO-ATC,

National Drug Codes

N/A

N/A

N/A

N/A

WHO-ATC,

National Drug Codes

N/A

N/A

N/A

WHO-ATC,

National Drug Codes

Drug information

Prescriptions, data on strength and length

N/A

N/A

N/A

N/A

Prescriptions, data on strength and length

N/A

N/A

N/A

Prescriptions, data on strength and length

  1. DW Data warehouse, CMBD, Conjunto mínimo básico de datos (Basic minimum set of data), ECAP, Estació clínica d’atenció primària (electronic health records in primary healthcare), Ap-Madrid Electronic Medical Record of Primary Care of Madrid, ICD 9 International Classification Diseases, 9th revision, ICD 10 International Classification Diseases, 10th revision, ICPC-2 International Classification Diseases, 2th revision, N/A not applicable
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BMC Nephrology

ISSN: 1471-2369

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