Topic

Data

What the published distributions say, and how far self-reported figures drift from them.

14 August 2026 2 min readData

What the published data actually says

One large meta-analysis, measurements taken by health professionals rather than self-reported. The numbers are lower and the distribution is narrower than almost anyone expects.

Other topics

MethodHow to take a measurement that is repeatable and comparable.DataWhat the published distributions say, and how far self-reported figures drift from them.GearTape, ruler, or neither - what changes the reading.