Table 2 Demographics of the primary care data collection projects

UK

CPRD

13 million (20%)

600 GPs

[15]

THIN

11.1 million (17%)

562 GPs

[16]

Qresearch

18 million (28%)

1000 GPs

[42]

USA

Veterans database

17 million (5%)

GPs unknown (53,000 healthcare professionals)

[154]

Geisinger© Health System project

400,000 (0.1%)

GPs unknown (41 community practice clinics)

General Electric Centricity©

8.9 million (2.8%)

7259 GPs

[163, 164]

OCHIN, Inc

1 million patients annually (0.3%)

GPs unknown (200 clinic sites)

[22]

Baylor Health Care System (BHCS) and Christiana Care Health System (CCHS)

680,000 patients (0.2%)

GPs unknown (33 primary care practices + 35 office practices)

[166]

University of California Davis Health System’s electronic medical record system

unknown

GPs unknown (13 clinics in this analysis)

[168]

CHCI – Connecticut

130,000 (0.04%)

GPs unknown (13 primary health centers)

[170]

MGPO

87,568 patients in this study (0.02%)

148 GPs in this study

[19]

OpenDoor

40,000 patients annually (0.01%)

GPs unknown (4-site federally qualified community health center in New York)

[173]

New York City Primary Care Information Project

unknown

GPs unknown (82 practices)

[21]

IFH

90,000 patients (0.02%)

GPs unknown (17 community health centers)

[20]

Department of Family Medicine – Wisconsin

110,000 for these studies (0.03%)

GPs unknown (28 primary care clinics)

[178, 179]

Canada

CPCSSN

1.28 million (3.6%)

1031 GPs

[24, 56]

EMRALD

0.5 million (1.4%)

350 GPs

[74]

DELPHI

30,000 (0.08%)

30 GPs

[24]

Netherlands

IPCI

1.5 million (8.8%)

600 GPs

[29, 38]

Nivel-PCD

LINH

1.6 million (10%)

350,000 (2%)

GPs unknown (500 practices)

85–150 GPs

[41, 83, 85]

Julius

156,176 (0.9%)

60 GPs

[41, 87]

RNH

51,700 (0.3%)

65 GPs (22 practices)

[89]

Spain

SIDIAP

6 million (12.8%)

274 GPs

[90]

ECRPC

unknown

GPs unknown

BIFAP

3.2–4.8 million (6.8–10%)

1183 GPs

[94, 95]

Australia

GRAPHC

32,000 (0.1%)

GPs unknown (1 GP practice)

[48]

Canning Division of General Practice

unknown

GPs unknown (8 GP sites)

[50]

MEGPN

505,600 (2.1%)

578 GPs (141 practices)

[17]

Belgium

Intego

285,000 (2.5%)

GPs unknown (95 GP practices)

[52]

NIHDI

29,000 (0.25%)

GPs unknown (5000 practices)

[23]

France

LPD – Cegedim

1.5 million (2%)

1200 GPs (+ 750 various medical specialists)

[8]

Italy

Health Search Database / CSD©

2.5 million (4.1%)

900 GPs

[77]

Sweden

Swedestar project

unknown

GPs unknown

[96]

Switzerland

FIRE

113,335–293,000 (14–36%)

60–120 GPs

[97, 98]