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Table 1—

Demographic data of the study population and the participation rate in the OGTT of those invited: the DECODE study

Study cohort (Code)Mean age [range (years)]Participated in OGTT [n (%)]Men (%)Blood glucose sampleFasting timeTime of blood samplingGlucose assay methodYears of screeningLocation
MONICA-Sweden 1986 (1) 47 (30–64) 553 (78) 50.6 Plasma Overnight 7:45–10:00 Glucose oxidase 1986 Suburban 
MONICA-Sweden 1990 (2) 47 (30–64) 711 (63) 47.0 Plasma Overnight 7:45–10:00 Glucose oxidase 1990 Suburban 
MONICA-Sweden 1994 (3) 52 (30–74) 903 (62) 48.4 Plasma Overnight 7:45–10:00 Glucose oxidase 1994 Suburban 
MONICA-Finland (4) 54 (40–64) 1,841 (76) 45.4 Plasma Overnight 8:00–10:00 Glucose dehydrogenase 1992 Urban 
Oulu, Finland (5) 76 (70–89) 309 (78) 38.8 Capillary 10–12 h 8:00–10:00 Glucose dehydrogenase 1992 Urban 
Hoom, Dutch (6) 62 (50–77) 2,364 (71) 46.4 Plasma ≥ 10 h 8:00–10:00 Glucose dehydrogenase 1989–1991 Urban 
Newcastle, U.K. (7) 55 (30–76) 778 (91) 51.7 Plasma Overnight 8:00–10:00 Glucose oxidase 1992–1994 Urban 
MONICA-Poland (8) 58 (44–73) 359 (81) 47.9 Serum 12 h 8:00–11:00 Glucose oxidase 1992–1993 Urban 
Cremona, Italy (9) 58 (40–89) 1,672 (87) 44.0 Plasma ≥ 12 h 8:30–10:30 Glucose oxidase 1990–1991 Urban 
Viva, Spain (10) 50 (34–69) 1,948 (72) 45.2 Plasma Overnight 8:00–9:00 Glucose oxidase 1996–1997 Urban and rural 
Catalonia, Spain (11) 54 (30–89) 1,835 (93) 42.3 Capillary 12 h 9:00–11:00 Refractometric 1994 Urban 
Guia, Spain (12) 55 (30–89) 588 (100) 44.6 Plasma 12 h 8:00–10:00 Glucose oxidase 1997 Island 
Malta (13) 49 (30–87) 1,745 (73) 43.2 Capillary Overnight Morning Glucose oxidase 1981 Island 
Total 54 (30–89) 15,606 45.4       
Study cohort (Code)Mean age [range (years)]Participated in OGTT [n (%)]Men (%)Blood glucose sampleFasting timeTime of blood samplingGlucose assay methodYears of screeningLocation
MONICA-Sweden 1986 (1) 47 (30–64) 553 (78) 50.6 Plasma Overnight 7:45–10:00 Glucose oxidase 1986 Suburban 
MONICA-Sweden 1990 (2) 47 (30–64) 711 (63) 47.0 Plasma Overnight 7:45–10:00 Glucose oxidase 1990 Suburban 
MONICA-Sweden 1994 (3) 52 (30–74) 903 (62) 48.4 Plasma Overnight 7:45–10:00 Glucose oxidase 1994 Suburban 
MONICA-Finland (4) 54 (40–64) 1,841 (76) 45.4 Plasma Overnight 8:00–10:00 Glucose dehydrogenase 1992 Urban 
Oulu, Finland (5) 76 (70–89) 309 (78) 38.8 Capillary 10–12 h 8:00–10:00 Glucose dehydrogenase 1992 Urban 
Hoom, Dutch (6) 62 (50–77) 2,364 (71) 46.4 Plasma ≥ 10 h 8:00–10:00 Glucose dehydrogenase 1989–1991 Urban 
Newcastle, U.K. (7) 55 (30–76) 778 (91) 51.7 Plasma Overnight 8:00–10:00 Glucose oxidase 1992–1994 Urban 
MONICA-Poland (8) 58 (44–73) 359 (81) 47.9 Serum 12 h 8:00–11:00 Glucose oxidase 1992–1993 Urban 
Cremona, Italy (9) 58 (40–89) 1,672 (87) 44.0 Plasma ≥ 12 h 8:30–10:30 Glucose oxidase 1990–1991 Urban 
Viva, Spain (10) 50 (34–69) 1,948 (72) 45.2 Plasma Overnight 8:00–9:00 Glucose oxidase 1996–1997 Urban and rural 
Catalonia, Spain (11) 54 (30–89) 1,835 (93) 42.3 Capillary 12 h 9:00–11:00 Refractometric 1994 Urban 
Guia, Spain (12) 55 (30–89) 588 (100) 44.6 Plasma 12 h 8:00–10:00 Glucose oxidase 1997 Island 
Malta (13) 49 (30–87) 1,745 (73) 43.2 Capillary Overnight Morning Glucose oxidase 1981 Island 
Total 54 (30–89) 15,606 45.4       
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