Table 1. Number of Procedures Affected by Assumed Increases in Annual Thyroidectomy Volumes in Generalized Linear Mixed-Effects Modeling.

Actual Annual Surgeon Volume, No.	Assumed Increase to Annual Surgeon Volume, No.	Procedures Affected, No. (Cumulative %)a
1-9	10	2912 (29.0)
1-19	20	6305 (62.9)
1-29	30	8419 (84.0)
1-39	40	9644 (95.8)

^a Total cumulative percentage is less than 100% because 4.2% of the procedures were performed by surgeons with annual volumes of 40 or more; their annual volumes were unchanged in the analysis.