Table 2.

Results of EM resident-performed 2-point compression ultrasounds and calculated test characteristics.

	Positive radiology ultrasound	Negative radiology ultrasound
Positive ED ultrasound	16	10
Negative ED ultrasound	12	250
Sensitivity, %	57.1 (95% CI [38.8–75.5])	--
Specificity, %	--	96.1 (95% CI [93.8–98.5])
Positive predictive value	61.5% (95% CI [42.8–80.2])	--
Negative predictive value	--	95.4% (95% CI [92.9–98.0])
Positive likelihood ratio	14.9 (95% CI [7.5–29.5])	--
Negative likelihood ratio	--	0.45 (95% CI [0.29–0.68])

ED, emergency department