Wikipedia HbA1c quiz—I have a nitpicky objection to the article that is probably not the “serious error” you have in mind. In this statment:
The HbA1c level is proportional to average blood glucose concentration over the previous four weeks to three months…
…I object to the word proportional because there’s a non-zero constant term in the linear relationship between HbA1c and the midpoint of the eAG range, as can be seen in the table that north40000 posted in #msg-60560038. For instance, HbA1c=6% corresponds to an eAG point estimate of 126 mg/dL, while HbA1c=12% corresponds to an eAG point estimate of 298; thus, the 12% number is about 2.4-fold higher than the 6% number (rather than being only twice as much).
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”