Prevalence of changes in undiagnosed glucose intolerance according to age and gender in Japanese middle-aged working people.

Background: Undiagnosed diabetes mellitus (DM) and impaired glucose tolerance (IGT) have important health consequences.

Methods And Results: To examine the prevalence of undiagnosed glucose intolerance, oral glucose tolerance tests were administered to 1,142 consecutively enrolled middle-aged subjects (age range 40-55 years; 914 men, mean 50.7 years; 228 women, mean 49.