TABLE 2.

Variables which predicted or failed to predict the detection of ipaH by real-time PCR amplification in 560 specimens tested

Variable	Real-time PCR negative	Real-time PCR positive	Crude odds ratio (95% CI)	Adjusted odds ratioa (95% CI)
No. (%) of patients
Total	274 (100)	286 (100)
Shigella culture positive	5 (2)	55 (19)	12.8 (5.0-32.5)	12.5 (4.9-32.1)
S. flexneri culture positive	5 (2)	40 (14)	8.7 (3.4-22.5)	9.2 (3.5-24.1)
S. sonnei culture positive	0 (0)	15 (5)
With a history of fever	21 (8)	63 (22)	3.4 (2.0-5.8)	2.4 (1.4-4.2)
With dysentery	113 (41)	173 (61)	2.2 (1.6-3.1)	2.1 (1.5-3.1)
Of female gender	140 (51)	152 (53)	1.1 (0.8-1.5)	1.1 (0.8-1.6)
Maximum no. of bowel movementsb	5.0	6.4	1.1 (1.1-1.2)	1.1 (1.0-1.2)
No. of days of diarrhea prior to presentation	1.6	1.6	1.0 (0.9-1.1)	1.0 (0.9-1.0)
No. (%) of patients with self-reported antibiotic usec	14 (5)	12 (4)	0.9 (0.4-2.0)	0.9 (0.4-2.2)

^aAdjusted for culture-proven shigellosis, a history of fever, and dysentery.

^bThe maximum number of bowel movements during any 24-h period prior to presentation.

^cHistory of self-medication with antibiotics prior to presentation.