Table 1.

Patient characteristics with moderate to high pre-test probability.

	Appendicitis (n=28)	No appendicitis (n=48)
Age, mean	23.9 ±13.1	28.7 ±16.1
Age <18	12	12
Sex (M)	69.6%	59.5%
BMI	24.5 ±6.6	26.3 ±4.7
Symptom duration (d)	1.1 ±1.1	1.5 ±1.6
Fever	32.1%	27.1%
Vomiting	50.0%	41.7%
Rebound	46.4%	27.1%
Migration	82.1%	27.1%
Anorexia	78.6%	56.3%
White blood cells	12.9 ±3.8	10.7 ±5
Alvarado score	4.6 ±1.4	2.2 ±1.3
Formal radiology imaging	90%	90%