Glucose indices, health behaviors, and incidence of diabetes in Australia: the Australian Diabetes, Obesity and Lifestyle Study.
OBJECTIVE
This national, population-based study reports diabetes incidence based on oral glucose tolerance tests (OGTTs) and identifies risk factors for diabetes in Australians.


METHODS
The Australian Diabetes, Obesity and Lifestyle Study followed-up 5,842 participants over 5 years. Normal glycemia, impaired fasting glucose (IFG), impaired glucose tolerance (IGT), and diabetes were defined using World Health Organization criteria.


RESULTS
Age-standardized annual incidence of diabetes for men and women was 0.8% (95% CI 0.6-0.9) and 0.7% (0.5-0.8), respectively. The annual incidence was 0.2% (0.2-0.3), 2.6% (1.8-3.4), and 3.5% (2.9-4.2) among those with normal glycemia, IFG, and IGT, respectively, at baseline. Among those with IFG, the incidence was significantly higher in women (4.0 vs. 2.0%), while among those with IGT, it was significantly higher in men (4.4 vs. 2.9%). Using multivariate logistic regression, hypertension (odds ratio 1.64 [95% CI 1.17-2.28]), hypertriglyceridemia (1.46 [1.05-2.02]), log fasting plasma glucose (odds ratio per 1 SD 5.25 [95% CI 3.98-6.92]), waist circumference (1.26 [1.08-1.48]), smoking (1.70 [96% CI 1.11-2.63]), physical inactivity (1.56 [1.12-2.16]), family history of diabetes (1.82 [1.30-2.52]), and low education level (1.85 [1.04-3.31]) were associated with incident diabetes. In age- and sex-adjusted models, A1C was a predictor of diabetes in the whole population, in those with normal glycemia, and in those with IGT or IFG.


CONCLUSIONS
Diabetes incidence is 10-20 times greater in those with IGT or IFG than those with normal glycemia. Measures of glycemia, A1C, metabolic syndrome components, education level, smoking, and physical inactivity are risk factors for diabetes.
Magliano
Dianna J
DJ
International Diabetes Institute, 250 Kooyong Rd., Caulfield, Victoria, 3162, Australia. dmagliano@idi.org.au
Barr
Elizabeth L M
EL
Zimmet
Paul Z
PZ
Cameron
Adrian J
AJ
Dunstan
David W
DW
Colagiuri
Stephen
S
Jolley
Damien
D
Owen
Neville
N
Phillips
Patrick
P
Tapp
Robyn J
RJ
Welborn
Tim A
TA
Shaw
Jonathan E
JE
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001315:Australia / Q000453:epidemiology; D001786:Blood Glucose / Q000032:analysis; D003430:Cross-Sectional Studies; D003920:Diabetes Mellitus / Q000453:epidemiology* / Q000523:psychology; D015444:Exercise; D005260:Female; D018149:Glucose Intolerance / Q000453:epidemiology; D005951:Glucose Tolerance Test; D015438:Health Behavior; D006306:Health Surveys; D006801:Humans; D015228:Hypertriglyceridemia / Q000453:epidemiology; D015994:Incidence; D008019:Life Style; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D015995:Prevalence; D012307:Risk Factors; D016540:Smoking Cessation; D011795:Surveys and Questionnaires
D001786:Blood Glucose