Table 4. NAR in Females and Males, 16-45 years.

WBC: white blood cells; CRP: C-reactive protein; NAR: negative appendicectomy rate

	NAR of patients aged 16-45 years (%)
	All (n=261)	Females (n=156)	Males (n=105)	p-value
Histology
Normal WBC/CRP	67.1 (55/82)	71.0 (44/62)	55.0 (11/20)	0.19
Raised WBC/CRP	24.6 (44/179)	35.1 (33/94)	11.8 (10/85)	<0.001
Ultrasound scan findings
Inflamed	19.0 (4/21)	15.0 (3/20)	100.0 (1/1)	0.19
Appendix not visualized	54.8 (51/93)	56.7 (51/90)	33.3 (1/3)	0.42
Appendix not visualized (raised WBC/CRP)	38.0 (19/50)	38.3 (18/47)	33.3 (1/3)	0.86
Appendix not visualized (normal WBC/CRP)	76.7 (33/43)	76.7 (33/43)	N/A	-
Computed tomography of abdomen and pelvis findings
Inflamed	86.4 (8/59)	78.6 (6/28)	6.5 (2/31)	0.09
Normal	60.0 (6/15	50.0 (4/8)	42.9 (3/7)	0.78