Table 2.

Characteristics and stool microscopic examination of patients with intestinal amebiasis and shigellosis 15 years of age and above

	Intestinal amebiasis N = 261 (%)	Shigellosis N = 783 (%)	Unadjusted OR (95% CI)	Adjusted OR (95% CI)*
Male sex	145 (56)	501 (64)	0.70 (0.52, 0.94) 0.018	1.09 (0.75, 1.61) 0.635
Illiterate mother	219 (84)	617 (79)	1.40 (0.95, 2.07) 0.089	–
Illiterate father	192 (74)	523 (67)	1.38 (1.00, 1.91) 0.049	0.85 (0.56, 1.29) 0.441
Poor socio-economic status (median monthly family income ≤ US$40)	132 (50)	437 (56)	0.80 (0.60, 1.07) 0.131	–
Living in the slum	49 (19)	95 (12)	1.37 (1.13, 2.48) 0.009	1.88 (1.12, 3.14) 0.016
Use of sanitary toilet	149 (57)	430 (55)	1.09 (0.82, 1.46) 0.589	–
History of abdominal pain	185 (71)	620 (79)	0.64 (0.46, 0.89) 0.007	1.18 (0.77, 1.81) 0.433
Fever (temperature 37.8°C)	14 (5)	70 (9)	0.58 (0.31, 1.08) 0.087	–
Duration of diarrhea (< 1 d)	148 (57)	273 (35)	2.45 (1.82, 3.29) < 0.001	1.08 (0.72, 1.64) 0.689
Watery stool (lack of mucus/blood)	219 (84)	368 (47)	5.88 (4.05, 8.56) < 0.001	2.21 (1.37, 3.55) 0.001
Dehydration (moderate/severe)	113/193 (59)	236/651 (36)	2.48 (1.77, 3.49) < 0.001	1.36 (0.91, 2.04) 0.130
BMI (< 18.5)	132 (54)	367 (50)	1.17 (0.87, 1.58) 0.329	–
Use of antimicrobial prior to hospital visit	123 (47)	522 (67)	0.43 (0.33, 0.60) < 0.001	0.67 (0.46, 0.99) 0.047
Death	1 (< 1)	2 (< 1)		–
Red blood cell/hpf (1 to > 50)	120 (46)	602 (77)	0.25 (0.18, 0.34) < 0.001	0.45 (0.22, 0.94) 0.036
Fecal leukocytes/hpf (11 to > 50)	141 (54)	672 (86)	0.19 (0.13, 0.26) < 0.001	0.21 (0.12, 0.35) < 0.001
Macrophage/hpf (1 to 10)	81 (31)	575 (74)	0.16 (0.12, 0.22) < 0.001	0.18 (0.03, 1.43) 0.107
pH (alkali)	231 (88)	669 (86)	1.29 (0.81, 2.04) 0.304	–

^*Variables that were found to be significant in univeriate analysis were included in the multivariate model.

OR = odds ratio; CI = confidence interval; BMI = body mass index.