TABLE 2.

Characteristics of participating patients

Characteristic	Casesa			P valueb
	All (n = 57)	Amoebic appendicitis (n = 9)	Nonamoebic appendicitis (n = 48)
Age (years)	34 (22–70)	32 (26–46)	35 (22–70)	0.53
Male sex	55 (96)	9 (100)	46 (96)	0.71
MSM	47 (82)	8 (89)	39 (81)	0.50
Japanese nationality	53 (93)	7 (78)	46 (96)	0.11
History of amoebiasis	7 (12)	2 (22)	5 (10)	0.30
Antiretroviral therapy	38 (67)	5 (56)	33 (69)	0.34
CD4 count (cells/μl)	400 (56–1,443)	497 (159–880)	399 (56–1,443)	0.24
HIV-RNA (log copies/ml)	UDd (UD–5.4)	2.4 (UD–5.1)	UD (UD–5.4)	0.45
Disease duration (days)	3 (1–15)	2 (1–15)	3 (1–13)	0.67
Fever	19 (33)	4 (44)	15 (31)	0.34
Abdominal pain	57 (100)	9 (100)	48 (100)	na
Diarrhea	5 (9)	1 (11)	4 (8)	0.59
Dysentery	1 (2)	1 (11)	0 (0)	0.16
Leukocyte count (cells/μl)	11,160 (3,590–26,060)	13,760 (10,100–18,200)	10,385 (3,590–26,060)	0.02
CRPc (mg/dl)	2.79 (0.01–37.7)	8.43 (1.13–15.4)	2.46 (0.01–37.7)	0.21
E. histolytica antibody positive	14/43 (33)	4/9 (44)	10/34 (29)	0.31
Fecalith	18/56 (32)	3/9 (33)	15/47 (32)	0.61
Peritonitis	29 (51)	4 (44)	25 (52)	0.47

^aData are presented as n (%) of patients or median (range).

^bP values represent comparisons of continuous and categorical variables by Mann–Whitney U and Fisher's exact tests, respectively.

^cCRP, C-reactive protein.

^dUD, undetectable.