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 sample | Fasting time | Time of blood sampling | Glucose assay method | Years of screening | Location |
|---|---|---|---|---|---|---|---|---|---|
| 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 |