Usefulness of Nonenhanced Computed Tomography for Diagnosing Urolithiasis without Pyuria in the Emergency Department

Table 3

Categorization of diagnoses in the IVU and NECT groups.

Characteristic	All	IVU	NECT	value
	( = 2218)	( = 1525)	( = 693)
Radiologic finding (%)
No cause of pain	655 (29.5)	586 (38.4)	69 (10.0)	<0.001
Urolithiasis	1413 (63.7)	905 (59.3)	508 (73.3)	<0.001
>4 mm	447 (20.1)	305 (20.0)	142 (20.5)	0.79
No urolithiasis cause
Acutely important	39 (1.8)	14 (0.9)	25 (3.6)	<0.001
Follow-up recommended	75 (3.4)	18 (1.2)	56 (8.1)	<0.001
Other unimportant causes	36 (1.6)	1 (0.1)	35 (5.1)	<0.001
Full record review (%)
No cause of pain	632 (28.5)	564 (37.0)	68 (9.8)	<0.001
Urolithiasis	1433 (64.6)	899 (59.0)	516 (74.4)	<0.001
>4 mm	450 (20.2)	308 (20.2)	142 (20.5)	0.87
No urolithiasis cause
Acutely important	23 (1.0)	14 (0.9)	9 (1.3)	0.41
Follow-up recommended	94 (4.2)	29 (1.9)	65 (9.4)	<0.001
Other unimportant causes	36 (1.6)	1 (0.1)	35 (5.1)	<0.001