Determinants of progression from impaired fasting glucose and impaired glucose tolerance to diabetes in a high-risk screened population: 3 year follow-up in the ADDITION study, Denmark.
OBJECTIVE
We sought to identify determinants of progression from impaired fasting glucose (IFG) and impaired glucose tolerance (IGT) to diabetes in high-risk screened individuals.


METHODS
In general practices in Denmark, stepwise screening for type 2 diabetes mellitus in persons aged 40 to 69 years included a risk questionnaire, random blood glucose, HbA1c, fasting blood glucose and an OGTT. The 1,821 individuals with IGT or isolated IFG (WHO 1999) were re-invited after 1 and 3 years. Follow-up data on glucose measurements were available in 1,510 individuals and additional clinical data in 1,002 collected at the 3-year visits. Regression models using interval censoring were used.


RESULTS
Progression rates from IFG and IGT to diabetes over 3.5 years were 11.8 and 17.0 per 100 person-years, respectively and were particularly high in the first year. Baseline determinants of progression were: IFG: glucose measures, BMI [per kg/m2, rate ratio (RR) 1.04 (95% CI, 1.01-1.08)] and triacylglycerol [per twofold increase, RR 2.19 (1.49-3.22)]; and IGT: glucose measures and known hypertension [RR 1.46 (1.11-1.93)]. Weight reduction and decreased triacylglycerol were inversely associated with development of diabetes in IFG individuals [per 1 kg/year, RR 0.81 (0.66-0.98) and per 1 mmol l(-1) year(-1), RR 0.08 (0.01-0.51), respectively], whereas in IGT participants only weight reduction was inversely associated [per 1 kg/year, RR 0.80 (0.67-0.96)].


CONCLUSIONS
Higher levels of glucose measures, larger BMI, known hypertension and hypertriacylglycerolaemia are significant determinants of progression in high-risk screened individuals. Weight loss of 1 kg/year or reduction of hypertriacylglycerolaemia markedly reduced the risk of diabetes.
Steno Diabetes Center, Niels Steensensvej 1, 2820, Gentofte, Denmark. SSSR@steno.dk
S S
SS
Rasmussen
C
C
Glümer
A
A
Sandbaek
T
T
Lauritzen
K
K
Borch-Johnsen
D000328:Adult; D000368:Aged; D001786:Blood Glucose / Q000032:analysis*; D015992:Body Mass Index; D003718:Denmark / Q000453:epidemiology; D003920:Diabetes Mellitus / Q000097:blood* / Q000453:epidemiology / Q000503:physiopathology; D018450:Disease Progression; D005215:Fasting / Q000097:blood*; D005260:Female; D018149:Glucose Intolerance / Q000097:blood* / Q000453:epidemiology / Q000503:physiopathology; D006801:Humans; D006973:Hypertension / Q000097:blood / Q000503:physiopathology; D015228:Hypertriglyceridemia / Q000097:blood / Q000503:physiopathology; D008297:Male; D008403:Mass Screening / Q000379:methods; D008875:Middle Aged; D012307:Risk Factors
D001786:Blood Glucose