Table 2.

 Outcome of pregnancy at 16 weeks' gestation related to bacterial vaginosis status at recruitment in 1189 women. Values are numbers (percentages) unless stated otherwise

	Bacterial vaginosis status			Relative risk (95% CI) of miscarriage if positive†
	Positive (n=170)	Intermediate (n=54)	Negative (n=965)
Any miscarriage	19 (11.2)	5 (9.3)	97 (10.1)	1.15 (0.70 to 1.87)
Gestation time of miscarriage:
<10 weeks	4 (2.4)	2 (3.7)	45 (4.7)	0.53 (0.19 to 1.47)
10-12 weeks	10 (5.9)	1 (1.9)	45 (4.7)	1.32 (0.67 to 2.62)
13-15 weeks	5 (2.9)	2 (3.7)	7 (0.7)	3.45 (1.16 to 10.29)*
Still pregnant at 16 weeks	144 (84.7)	48 (88.9)	863 (89.4)
Termination of pregnancy at known date‡	7 (4.1)	1 (1.9)	5 (0.5)

^*P<0.05. 

^†Calculated with Cox regression. Women positive for bacterial vaginosis compared with women negative or intermediate combined. 

^‡Date of termination unknown in further 9 women who decided to have termination after enrolment.