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J Assoc Physicians India. 2018 Oct;66(10):22-26.

Incidence of Type 2 Diabetes is Higher among Men with Persistent Impaired Glucose Tolerance than in Transient Impaired Glucose Tolerance - A 5 year Follow up Study.

Author information

India Diabetes Research Foundation and Dr. A. Ramachandran's Diabetes Hospitals, Chennai, Tamil Nadu.
Hubert Department of Global Health, Emory Global Diabetes Research Center, Atlanta, USA.
Visakha Steel General Hospital, Visakhapatnam, Andha Pradesh.
Faculty of Medicine, Imperial College, London, UK.
India Diabetes Research Foundation and Dr. A. Ramachandran's Diabetes Hospitals, Chennai, Tamil Nadu;Corresponding Author.



This was a 5 year comparative analysis of the incidence of type 2 diabetes in men who had persistent impaired glucose tolerance (P-IGT) versus transient impaired glucose tolerance (T-IGT). P-IGT (positive IGT on two oral glucose tolerance tests (OGTT), T-IGT (IGT in first OGTT and normal glucose tolerance (NGT) in the 2nd OGTT).


The samples were collected from a randomized controlled diabetes prevention study. The prevention study was done using lifestyle modification (LSM) promoted by use of mobile short message services (SMS) for 2 years. The control group of the randomized study who received advice on LSM at only the baseline formed the P-IGT group for the 3 years follow up study (n=236). T-IGT (n=569) were available from those who had NGT on the 2nd OGTT while screening for the prevention study. The total diabetes incidence at 5 years in the study groups were compared using standard OGTT (WHO criteria).


The conversion rate to diabetes in 5 years was significantly lower among T-IGT than among P-IGT, OR=0.202 (95% CI, 0.145-0.296,p< 0.0001). P-IGT had higher rate of risk factors for diabetes than T-IGT.


The risk of conversion to diabetes was 80 percent lower in T-IGT than in P-IGT. Identification of P-IGT will help in selecting persons who require early intervention for diabetes.

[Indexed for MEDLINE]

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