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Table 1 Systematic review of T1D in adults, diagnostic criteria and sources of information

From: Global epidemiology of type 1 diabetes in young adults and adults: a systematic review

Study information

T1D diagnosis criteria in adults and young adults

Source of information and validation of ascertainment between sources

Country, area reported in the article

First author, publication year

Ref

Age range

Period

Detect. AA/C-Peptide

Need of insulin therapy

Administration insulin therapy

Clinical impression

Ketosis/ ketonuria

Weight loss

Primary

Secondary

Tertiary

% of ascertainment

African Region, LMIC

Mauritius: NW

Tuomileht J., 1993†

[13]

0-19

1986-1990

No

Yes

From diagnosis

Yes

NA

NA

Medical reports

Medical statistics

NA

95.0

United Republic of Tanzania: Dar es Salaam

Swai A. B., 1993†

[14]

0-19

1982-1991

No

Yes

From diagnosis

Yes

NA

NA

Medical reports

Hospital records

NA

NA

Eastern Mediterranean Region, LMIC

Iran (Islamic Republic of): Fars

Pishdad G. R., 2005 †

[15]

0-29

1990-1994

Yes (a)

Yes

From diagnosis

Yes

Yes

Yes

Medical reports from endocrinologists

Medical records

NA

100

Libyan Arab Jamahiriya: Benghazi

Kadiki O. A., 1996†

[16]

0-34

1981-1990

No

Yes

From diagnosis

NA

Yes

NA

National Diabetes Program

Hospital registers

NA

95.0

Tunisia: Beja, Monastir, Gafsa

Ben Khalifa F., 1998†

[17]

0-19

1990-1994

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

School health centers

NA

96.0

European Region, LMIC

Croatia: Zagreb

Roglic G., 1995†

[18]

0- > 55

1988-1992

No

Yes

Within 1 week of diagnosis

Yes

Yes

NA

National Diabetes Program

Death certificates

Diabetes association

96.2

Estonia: NW

Kalits I., 1990†

[19]

0- > 50

1988-1988

No

Yes

From diagnosis

Yes

Yes

Yes

NA

NA

NA

NA

Lithuania: NW

Ostrauskas R., 2011†

[20]

15-34

1991-2008

No

Yes

Within 2 weeks of diagnosis

Yes

Yes

Yes

National Diabetes Program

Regional endocrinologist

Notes of patient insurance

86.8

Lithuania: NW

Pundziute-Lycka A., 2003

[21]

0-39

1991-2000

No

Yes

Within 2 weeks of diagnosis

Yes

Yes

NA

National Diabetes Program

Pediatrician and endocrinologist reports

Death certificates

91.2

Lithuania: NW

Ostrauskas R., 2000

[22]

15-39

1991-1997

No

Yes

Within 2 weeks of diagnosis

Yes

Yes

NA

National Diabetes Program

Pediatrician and endocrinologist reports

Death certificates

91.2

Poland: Bialystok

Kretowski A., 2001†

[23]

0-29

1994-1998

No

Yes

From diagnosis

Yes

Yes

Yes

Pediatric and Internal medicine records

Hospital discharge registers

NA

98.5

Poland: Province of Rzeszow

Sobel-Maruniak A., 2006†

[24]

0-29

1980-1999

No

Yes

From diagnosis

Yes

NA

NA

Pediatric and Internal medicine records

Others health care registers

NA

99.0

Poland: Province of Rzeszow

Grzywa M. A., 1995

[25]

0-29

1980-1992

No

Yes

From diagnosis

Yes

NA

NA

Pediatric and Internal medicine records

Others health care registers

NA

99.0

Poland: Warsaw

Wysock M. J., 1992†

[26]

0-29

1983-1988

No

Yes

From diagnosis

Yes

NA

NA

Medical records from diabetic clinics

General practitioners and diabetologist registers

Death certificates

NA

Romania: Bucharest

Ionescu-Tirgoviste C., 1994†

[27]

0- ≥ 85

1981-1991

No

Yes

From diagnosis

Yes

Yes

NA

Bucharest Diabetes Registry

NA

NA

NA

Slovakia: NW

Kyvik K O, 2004†

[28]

15-29

1996-1997

No

Yes

From diagnosis

Yes

NA

NA

Pediatrician and endocrinologist reports

Other health care registers

NA

80.0

European Region, HIGH

Austria: Upper

Rami B., 2001†

[29]

0-29

1994-1996

No

Yes

From diagnosis

Yes

NA

NA

Pediatricians and endocrinologists reports

Austrian Diabetes Association

NA

87.0

Belgium: Antwerp

Weets I., 2007†

[30]

0-39

1989-2003

Yes

Yes

From diagnosis

Yes

NA

NA

Pediatricians and endocrinologists reports

General practitioners and diabetes nurses reports

Diabetes associations and self-reporting

97.0

Belgium: Antwerp

Weets I., 2002 †

[31]

0-39

1989-2000

Yes

Yes

From diagnosis

NA

NA

NA

Pediatrician and endocrinologist reports

General practitioner and diabetes nurse reports

Diabetes associations and self-reporting

93

Belgium: Antwerp

Vandewalle C., 1997 †

[32]

0-39

1989-1995

Yes

Yes

From diagnosis

Yes

Yes

Yes

Pediatrician and endocrinologist reports

General practitioner and diabetes nurse reports

Diabetes associations and self-reporting

85

Bosnia and Herzegovina: Republic of Srpska

Radosevic B., 2013†

[33]

0-18

1998-2010

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

Insulin prescription registers

NA

100

Denmark: Copenhagen and Frederiksborg

Molbak A. G., 1994†

[34]

30-95

1973-1977

Yes (b)

Yes

From diagnosis

Yes

Yes

Yes

Hospital discharges

General practitioners and diabetologist registers and death certificates

Missing coding of T1D diagnosis in hospital admissions

99.0

Finland: NW

Lammi N., 2007†

[35]

15-39

1992-1996

Yes

Yes

From diagnosis

Yes

NA

NA

National Diabetes Program

Hospital discharge registers

Drug reimbursement registers

88.0

France: Aquitaine, Lorraine, Basse Normandie, Haute Normandie

Charkaluk M. L, 2002†

[36]

0-19

1988-1997

No

Yes

None declared

NA

NA

NA

Prospective registers

French Social Security registers

NA

96.0

France: Aquitaine, Lorraine, Basse Normandie, Haute Normandie

Levy-Marchal, C., 1998

[37]

0-19

1988-1995

No

Yes

None declared

NA

NA

NA

Prospective registers

French Social Security registers

NA

96.0

Israel: NW

Blumenfeld O., 2014†

[38]

0-17

1997-2010

No

Yes

From diagnosis

Yes

NA

NA

Israel juvenile diabetes register

Israel Center for Disease Control

NA

NA

Israel: NW

Sella T., 2011

[39]

0-17

2000-2008

No

Yes

None declared

Yes

NA

NA

Israel juvenile diabetes register

Israel Center for Disease Control

NA

NA

Israel: NW

Koton S., 2007

[40]

0-17

1997-2003

No

Yes

From diagnosis

Yes

NA

NA

Israel juvenile diabetes register

NA

NA

NA

Italy: Lombardie

Garancini, P., 1991†

[41]

0-34

1981-1982

No

Yes

None declared

NA

NA

NA

Hospital discharge records

Hospital admission records

NA

85.7

Italy: Pavia

Tenconi M. T., 1995†

[42]

0-29

1988-1992

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

Drug registers

NA

100

Italy: Sardinia

Muntoni S, 1992†

[43]

0-29

1989-1990

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

Diabetes association

NA

92.8

Italy: Sardinia (Oristano)

Frongia O., 1997†

[44]

0-29

1993-1996

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

Drug registers

NA

100

Italy: Turin

Bruno G., 2009†

[45]

15-29

2000-2004

Yes

Yes

Within 6 months of diagnosis

NA

NA

NA

Hospital records

Drug registers

NA

NA

Italy: Turin

Bruno G., 2005†

[46]

30-49

1999-2001

Yes

Yes

Within 6 months of diagnosis

NA

Yes

NA

Diabetes clinics

Drug registers

NA

99.0

Italy: Turin

Bruno G., 1993

[47]

0-29

1984-1988

No

Yes

From diagnosis

NA

Yes

NA

Diabetic clinics records

Hospital discharge records

NA

97.0

Luxembourg: NW

De Beaufort C. E., 1988†

[48]

0-19

1977-1986

No

Yes

None declared

NA

NA

NA

Pediatric and Internal medicine records

Dutch Diabetes Association

NA

100

Malta: NW

Schranz A. G., 1989†

[49]

0-24

1980-1987

No

Yes

Within 3 moths of diagnosis

Yes

Yes

Yes

Medical reports

Diabetic clinic records

NA

NA

Netherlands: NW

Ruwaard D., 1994†

[50]

0-19

1988-1990

No

Yes

None declared

NA

NA

NA

Pediatric and Internal medicine records

NA

NA

81.0

Norway: NW

Joner G., 1991†

[51]

15-29

1978-1982

No

Yes

From diagnosis

NA

NA

NA

Pediatricians and endocrinologists reports

Hospital records

NA

90.0

Slovenia: NW

Radosevic B., 2013†

[33]

0-18

1998-2010

No

Yes

From diagnosis

Yes

NA

NA

Slovenian National Registry of Childhood diabetes

Insulin prescription registers

NA

100

Spain: Badajoz

Morales-Perez F. M., 2000†

[52]

0-29

1992-1996

No

Yes

From diagnosis

Yes

Yes

NA

Pediatricians and endocrinologists reports

Diabetic clinic records

NA

95.0

Spain: Canarias Islands

Carrillo Dominguez, A., 2000†

[53]

0-30

1995-1996

No

Yes

None declared

Yes

NA

Yes

Hospital records and Endocrinologist reports

Diabetes association reports and sales on blood glucose monitors

NA

90.1

Spain: Catalonia

Abellana R., 2009†

[54]

0-29

1989-1998

Yes (c)

Yes

From diagnosis

Yes

Yes

NA

Catalan Registry of Type 1 Diabetes

Summer camps, associations, and prescription data

NA

90.0

Spain: Catalonia

Goday A., 1992

[55]

0-29

1987-1990

No

Yes

From diagnosis

Yes

NA

NA

Catalan Registry of Type 1 Diabetes

Summer camps, patient associations, and prescription data

NA

90.1

Spain: Navarra

Forga L., 2014†

[56]

0- > 45

2009-2012

Yes

Yes

Within 6 months of diagnosis

Yes

Yes

NA

Hospital records

Electronic medical records, diabetes associations

NA

98.4

Spain: Navarra

Forga L., 2013†

[57]

0-79

2009-2011

Yes

Yes

Within 6 months of diagnosis

Yes

Yes

NA

Hospital records

Electronic medical records, diabetes associations

NA

98.4

Sweden: NW

Dahlquist G. G., 2011†

[58]

0-34

1983-2007

No

Yes

From diagnosis

Yes

Yes

Yes

National Diabetes Program

Pediatricians and endocrinologist reports

NA

96.0

Sweden: NW

Östman J., 2008

[59]

15-34

1983-2002

No

Yes

From diagnosis

Yes

NA

NA

National Diabetes Program

Pediatrician and endocrinologist reports

Computer-based patient administrative register

82

Sweden: NW

Pundziute-Lycka A., 2002

[60]

0-34

1983-1998

No

Yes

From diagnosis

Yes

Yes

Yes

National Diabetes Program

Pediatrician and endocrinologist reports

Computer-based patient administrative register

91.2

Sweden: NW

Nyström L., 1992

[61]

0-34

1983-1987

No

Yes

None declared

NA

NA

NA

National Diabetes Program

Hospital admission and discharge registers

NA

89

Sweden: NW

Blohme G., 1992

[62]

15-34

1983-1987

No

Yes

From diagnosis

Yes

Yes

Yes

National Diabetes Program

Hospital admission and discharge registers

NA

NA

Sweden: Kronoberg

Thunander M., 2008†

[63]

0-100

1998-2001

Yes

Yes

Within 4 weeks of diagnosis

Yes

Yes

NA

Opportunistic screening of all adult patients in contact with the medical care system

Departments of ophthalmology

NA

98.0

United Kingdom: NW

Imkampe A. K., 2011†

[64]

0-34

1991-2008

No

Yes

Within 3 moths of diagnosis

Yes

NA

NA

National Diabetes Program

Pediatricians and endocrinologist reports

NA

NA

United Kingdom: Oxford region

Bingley P. J., 1989

[65]

0-21

1985-1986

No

Yes

From diagnosis

Yes

NA

NA

Medical reports from general practioners and pediatricians

Regional hospital records

NA

95.0

Region of the Americas, LMIC

Barbados: NW

Jordan O. W., 1994†

[66]

0-29

1982-1991

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

Others health care registers

NA

94.0

Region of the Americas, HIGH

Canada: Quebec

Legault L., 2006†

[67]

0-18

2000

No

Yes

None declared

NA

NA

NA

Departmental program: Régie des Rentes du Québec program

NA

NA

NA

United States of America: Alabama (Jefferson County)

Wagenknecht L. E., 1991†

[68]

0-19

1979-1988

No

Yes

None declared

NA

NA

NA

Hospital records

Summer camps, patient associations, and prescription data

NA

NA

United States of America: Alabama (Jefferson County)

Wagenknecht L. E.,1989

[69]

0-19

1979-1985

No

Yes

From diagnosis

Yes

NA

NA

Hospital records

Association registers

NA

95.0

United States of America: Colorado

Vehik K., 2007†

[70]

0-17

2000-2004

No

Yes

Within 2 weeks of diagnosis

Yes

NA

NA

Pediatricians and endocrinologists reports

Other health care registers

The SEARCH Study

96.5

United States of America: Colorado

Kostraba J. N., 1992

[71]

0-17

1978-1988

No

Yes

Within 2 weeks of diagnosis

Yes

NA

NA

Pediatricians and endocrinologists reports

Hospital registers

NA

93.3

United States of America: Pennsylvania (Allegheny)

Libman I. M., 1998†

[72]

0-19

1990-1994

No

Yes

From diagnosis

Yes

NA

NA

Medical reports

General practitioners and diabetes nurses reports

NA

97.7

United States of America: Rhode Island

Fishbein H. A., 1982†

[73]

0-29

1979-1980

No

Yes

None declared

NA

NA

NA

Medical reports

Insulin prescription registers

NA

NA

United States of America: five areas §

Bell R., 2009 †

[74]

0-19

2002-2005

Yes

Yes

From diagnosis

Yes

NA

NA

Medical reports

Other health care registers

The SEARCH Study

NA

United States of America: Wisconsin

Allen C., 1986†

[75]

0-29

1970-1979

No

Yes

From diagnosis

Yes

NA

NA

Hospital discharges

Pediatricians and endocrinologist reports

NA

90.0

United States of America: The United States Navy

Gorham C., 1993

[76]

17-34

1974-1988

No

NA*

None declared

Yes

NA

NA

Hospital discharges

NA

NA

NA

Western Pacific Region, HIGH

Australia: New South Wales

Tran F., 2014†

[77]

10-18

2001-2008

No

Yes

NA

Yes

NA

Yes

Endocrine group diabetes register

National diabetes register

NA

96.0

Australia: Sydney (Southern Metropolitan Health Region)

Sutton L., 1989†

[78]

0-19

1984-1987

No

Yes

From diagnosis

Yes

NA

NA

Medical reports from general practioners and pediatricians

Schools in the area

Syringe register

NA

Japan: Osaka

Sasaki A., 1992†

[79]

0-18

1978-1988

No

Yes

None declared

Yes

Yes

NA

Medical benefits system

NA

NA

NA

New Zealand: Canterbury

Scott, R. S., 1991†

[80]

0- ≥ 80

1981-1986

No

Yes

Within 1 year of diagnosis

Yes

NA

Yes

Community-based surveys administrated in pharmacies where diabetic patients acquired their insulin supplies

Hospital admission and discharge registers and diabetologist

NA

95.0

Other Regions currently non WHO

Taiwan: NW

Lin W.-H., 2013 †

[81]

0- ≥ 60

1999-2010

Yes

Yes

None declared

Yes

Yes

NA

National Health Insure register and Illness certificates

Random sample of a database used to reimbursements

NA

98.3

US Virgin Islands: NW

Washington R. E., 2013†

[82]

0-19

2001-2010

No

Yes

From diagnosis

Yes

Yes

Yes

Medical reports

Medical providers

NA

98.7

  1. WHO Member States are divided into high-income (HIGH) or low- and middle-income (LMIC) states [30]. AA: autoantibodies, NW: Nation-wide study, NA: Unavailable data. (a) When there were diagnostic doubts, (b) Only for patients aged over 40 years at onset, (c) Not performed in all cases; the author of this study was contacted to confirm the proportion of these cases, but by the time of submission of this paper no answer was available. T1D: Type 1 Diabetes. Highlighted: reports of the systematic review using the autoantibodies/C-peptide as diagnosis criteria. (†) Studies used in the statistical analyses. (*) Data were not available but researchers assumed that patients have had T1D based on their average of age. (§) Ohio (8 counties), Washington State (5 counties), South Carolina, Colorado, California.