Table 1.

Patient characteristics and ultrasound findings

	All (n = 62)	Appendicitis (n = 27, 44%)	Non-appendicitis (n = 35, 56%)	p-value
Age (years)	28.5 ± 19.9	30.9 ± 19.3	26.6 ± 20.4	0.4
Sex				0.59
F	30 (48%)	12 (44%)	18 (51%)
M	32 (52%)	15 (56%)	17 (49%)
BMI	21.5 ± 3.3	22.9 ± 2.7	20.4 ± 3.4	0.005
Appendix visualization on ultrasound				0.5
No	2 (3%)	0 (0%)	2 (6%)
Yes	59 (95%)	27 (100%)	32 (91%)
Partial	1 (2%)	0 (0%)	1 (3%)
Appendix maximal diameter (mm)	6.1 ± 2.2	6.5 ± 2.6	5.8 ± 1.8	0.24
Appendix wall thickness (mm)	1.6 ± 0.9	2.0 ± 1.1	1.3 ± 0.7	0.01
Appendix luminal diameter (mm)	3.3 ± 1.9	3.8 ± 2.2	3.0 ± 1.5	0.09
Increased wall flow in appendix				0.001
No	42 (70%)	12 (44%)	30 (91%)
Yes	18 (30%)	15 (56%)	3 (9%)
Appendix mucosal discontinuity				0.001
No	48 (80%)	16 (59%)	32 (97%)
Yes	7 (12%)	7 (26%)	0 (0%)
Indeterminate	5 (8%)	4 (15%)	1 (3%)
Non-compressibility of appendix				0.001
No	19 (32%)	1 (4%)	18 (55%)
Yes	36 (60%)	23 (85%)	13 (39%)
Indeterminate	5 (8%)	3 (11%)	2 (6%)
Probe tenderness over the appendix				0.001
No	28 (47%)	1 (4%)	27 (82%)
Yes	21 (35%)	20 (74%)	1 (3%)
Indeterminate	11 (18%)	6 (22%)	5 (15%)
Periappendiceal increased echo				0.039
No	53 (88%)	21 (78%)	32 (97%)
Yes	7 (12%)	6 (22%)	1 (3%)
Interval CT to ultrasound (min)	1232 ± 2607	1025 ± 3044	1392 ± 2246	0.59

BMI, body mass index; F, female; M, male.