Table 1. Patient characteristics including obstetrical history (n=77).

Characteristics	Min	P10	Median	P90	Max	No. (%)	95% CI
Age (yr)	21	29	35	43	46
Gesta (No.)	0	0	0	1	2
Vaginal delivery (No.)	0	0	0	0	1
C-section (No.)	0	0	0	1	2
Abortion (No.)	0	0	0	1	2
Nulliparous						48 (62.3)	52.2–76.1
Caucasiana)						52 (67.5)	56.3–78.8
Stable relationship with a male sexual partner						65 (84.4)	76.1–93.0
Never smoked						59 (77.6)	67.6–87.3
College graduates						53 (68.8)	57.7–80.3

All women had completed high school.

P10 and P90, 10^th and 90^th percentiles.

^a)The other 25 women were mixed (African descent).