Table 1. Prevalence of Escherichia coli among vaginal samples from pregnant women with normal gestation (A) and some risks at birth (B).

Pregnant women	Presence of E. coli	Absence of E. coli	Total
(A) with normal gestation	69 (11)	534 (89)	603
(B) with some risks at birth	13 (37) **	22 (63)	35
Total	82 (13)	556 (87)	638

Data are shown as no. (%).

**p-value: p = 0.000015