TABLE 2—

Prevalence of Bacterial Vaginosis (BV) in Relation to Gynecologic, Reproductive, and Lifestyle Factors: Site1 (n = 298), Michigan, 1998

Factora	Overall, % (No.)	BV+, % (No.)
Day of menstrual cycle at time of sampling among women with regular menses, <35-day cycle, and no exogenous hormones within past 6 months
Day 1–7	3 (10)	50 (5)
Day 8–14	10 (30)	27 (8)
Day 15–end	14 (41)	41 (17)
Day of menstrual cycle at time of sampling among women using exogenous hormones within past 6 months
Day 1–7	7 (20)	30 (6)
Day 8–14	14 (42)	21 (9)
Day 15–end	31 (91)	23 (21)
Exogenous hormone use within past 6 months (oral contraceptives, injections, implants)
No	37 (109)	41 (45)b
Yes	62 (185)	24 (44)*
No. of live births
None	54 (159)	19 (6)b
1	23 (68)	31 (21)
2	14 (41)	42 (18)
≥3	9 (27)	56 (15)*
Frequency of sexual intercourse without male or female condom within past 6 months
No intercourse	6 (19)	32 (6)
Intercourse always with condoms	14 (43)	19 (8)
1/6 mo to <1/d	66 (196)	30 (58)
≥1/ day	1 (4)	75 (3)
No. of male partners in lifetime
≤5	52 (155)	28 (44)
6–15	32 (94)	26 (24)
>15	7 (22)	45 (10)
Currently taking vitamin/nutritional supplement
No	70 (209)	34 (71)b
Yes	29 (87)	21 (18)*
Tampon use
No	26 (76)	37 (28)
Yes	63 (187)	28 (52)
No. of showers per week
None	6 (17)	59 (10)*
1–3	7 (21)	48 (10)*
≥4	86 (256)	28 (68)b
No. of baths per week
None	46 (138)	24 (33)*
1–3	39 (116)	30 (35)*
≥4	13 (40)	50 (20)b
Ever used a vaginal douche
No	36 (108)	20 (22)
Yes	63 (187)	36 (68)*
Age at first use of vaginal douche, y
<20 y	68 (127)	42 (53)*
≥20 y	30 (56)	25 (14)
Frequency of douching within past year
Not at all	63 (188)	23 (43)b
>1/y to <1/mo	14 (42)	33 (14)
≥1/mo	18 (56)	48 (27)*
Used vaginal douche within past 2 months
No	73 (218)	24 (52)
Yes	24 (72)	53 (38)

^aAll factors involved missing or nonapplicable data.

^bReference.

*P < .05.