“The numbers don’t lie,” said the home page at doihaveprediabetes.org. “1 in 3 American adults has prediabetes.”

The website invited me to take an online risk test, promising that it would require only a minute. The widely promoted site, part of a yearlong media campaign, bore the logos of the American Medical Association, the American Diabetes Association and the Centers for Disease Control and Prevention. About 292,000 people have taken the test.

Make that 292,001. I clicked on the yellow button and gave my gender, race and age range. I responded to a couple of questions about family history and my own medical history, said that I was physically active, and filled in my height and weight.

How did I do? “Based on these results, you’re likely to have prediabetes and are at high risk for Type 2 diabetes.” The site advised me to see my doctor for a blood test to confirm the results.