Table 2. Changes in Hospital Outlier Status by Outcome With and Without Thyroidectomy-Specific Variables Available for Risk Adjustment for 6 Outcomes^a.

With Thyroidectomy-Specific Variables	Without Thyroidectomy-Specific Variables
	Hypocalcemia (n = 96)			RLN Injury (n = 95)			Hematoma (n = 95)
	Low	Average	High	Low	Average	High	Low	Average	High
Low performance	3	1	0	7	1	0	0	0	0
Average performance	0	82	3	1	70	2	0	95	0
High performance	0	0	7	0	0	14	0	0	0
κ (95% CI)b	0.82 (0.65-0.99)			0.90 (0.80-1.00)			NA
With Thyroidectomy-Specific Variables	Morbidity (n = 98)			SSI (n = 98)			Readmission (n = 98)
	Low	Average	High	Low	Average	High	Low	Average	High
Low performance	1	0	0	0	0	0	0	0	0
Average performance	0	96	0	0	97	0	0	98	0
High performance	0	0	1	0	0	1	0	0	0
κ (95% CI)b	1.00 (1.00-1.00)			NA			NA

Abbreviations: NA, not applicable; RLN, recurrent laryngeal nerve; SSI, surgical site infection.

^aChanges in hospital outlier status when thyroidectomy-specific variables were (with) and were not (without) included for risk adjustment. Hospital outlier status represents statistically better (low) or worse (high) performance relative to the average hospital using the 95% CI for each hospital. Hospitals with 95% CIs completely below 1.0 represent low outliers (better performance), hospitals with 95% CIs completely above 1.0 represent high outliers (worse performance), and all other hospitals were designated average.

^bκ Statistics with 95% CIs were computed where possible.