Table 1.

Iterations of trigger definition until final definition was reached

Iteration	Denominator definition	Numerator definition	Error(s) identified
1	HbA1c greater than 10%	No follow-up encounter within 3 months of index HbA1c test	Trigger included patients who had subsequently died at time of trigger pull. Trigger excluded patients with a follow-up clinic visit but no follow-up HbA1c test
2	Currently alive & HbA1c greater than 10%	No follow-up HbA1c result	Trigger included patients with follow-up HbA1c results well beyond guideline-recommended timeframe
3	Currently alive & HbA1c greater than 10%	No follow-up HbA1c result within 3 months, including outside hospital records available	Trigger included pediatric patients and many patients with a follow-up HbA1c result right after 3 months
4	Currently alive patients 18 & older & HbA1c greater than 10%	No follow-up HbA1c result within 6 months, including outside hospital records available	None