Table 2. Difference Between Observed and Expected Anesthesia Times (Subgroup Analyses).

Group	Top Fifth Percentile (n = 212)		Top 6th to 10th Percentiles (n = 211)		Remaining Practitioners (n = 3798)
	Observed Minus Expected Anesthesia Time, Mean (95% CI), min	P Valuea	Observed Minus Expected Anesthesia Time, Mean (95% CI), min	P Valuea	Observed Minus Expected Anesthesia Time, Mean (95% CI), min
Facility type
University	26.5 (19.6 to 33.2)	<.001	−4.9 (−10.2 to 0.4)	.75	−5.9 (−8.9 to −2.9)
Community	16.5 (9.2 to 23.9)	<.001	0.2 (−3.7 to 4.1)	.91	0.4 (−0.4 to 1.3)
Other (specialty hospital or surgical center)	38.8 (20.6 to 56.9)	<.001	−0.9 (−3.6 to 1.7)	.36	−2.2 (−2.9 to −1.5)
Presence of anesthesia resident
Yes	31.4 (24.2 to 38.6)	<.001	−3.1 (−7.9 to 1.7)	.21	−4.0 (−6.4 to −1.6)
No	22.5 (10.0 to 35.0)	<.001	−1.2 (−7.4 to 4.9)	.90	−0.8 (−1.8 to 0.2)

^aP values represent the statistical significance of the difference between the given group and remaining practitioners.