HbA1c

The NYT linked to a study finding mental decline correlated with high blood sugar levels in people over 60. I really really like error bars on plots, but this is what they want us to see:

BTW, it looks like what was originally dotted lines turned into grey lines instead. Pre-diabetes--not too much additional effect, but diabetes was noticeable. Not disastrous, but noticeable. Given how high some of the A1c levels got, I'd have expected maybe a little more effect. (I'm not sure I understand their translations from mmol/mol to % on page 4.)