Bathtub Curves

There’s a concept in Reliability Engineering known as the bathtub curve.

The idea is that there’s a middle region where failures are fairly constant. Before that time there’s infant mortality -where we buy something and it’s broken in the first few days. Finally there’s a range where things are worn out and fail.

Causes of Mortality

There are similar curves of mortality rates for various causes of death. HbA1c numbers follow the same concept. Too high of an HbA1C number is bad (diabetes). Too low of a value is also bad because death from hypoglycemia is possible and there are other diseases which might produce a very low blood sugar. In the middle there’s a sweet spot with some “healthy” range.

For example: All-cause mortality HR for HbA1c values:

Too high of an HbA1c is bad. Too low is bad, too.

See also Hazard Ratio.

Author: Doug

I'm an Engineer who is also a science geek. I was pre-diabetic in 1996 and became a diabetic in 2003. I decided to figure out how to hack my diabetes and in 2016 found the ketogetic diet which reversed my diabetes.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.