Table 2. Frequency of diagnostic accuracy and values in patients in the ultrasound (US) and no ultrasound (control) groups.

	US, n (%)(n = 382)	No US, n (%)(n = 380)	Difference(%)	p Value
Correct diagnosis	247 (64.7)	216 (56.8)	7.9	0.027
Intention-to-treat (ITT) analyses	US (n = 400)	No US (n = 399)
All excluded incorrect	247 (61.8)	216 (54.1)	7.7	0.029
All excluded correct	265 (66.3)	235 (58.9)	8.4	0.032
US correct, not US incorrect	265 (66.3)	216 (54.1)	12.2	<0.001
US incorrect, not US correct	247 (61.8)	235 (58.9)	2.9	0.410