The cervical os is small and round , typical for a nulliparous woman 宫颈外口小而圆，呈现未经产女性的特点。
2.
Breast cancer is commoner among nulliparous women or women having their first child late 未生育过或较迟生育的妇女较易患上乳癌。
3.
Breast cancer is more common among nulliparous women and women who are over age 35 at the time of their first pregnancy 首次怀孕的年龄三十五岁以上才首次生育和从未生育的妇女。
4.
For nulliparous women ( i . e . , those who have never given birth ) and who ever used ocs and nulliparous women who used ocs for at least 4 years , corresponding ors were 1 . 24 and 1 . 29 曾使用过口服避孕药和使用口服避孕药四年以上的未产妇（未生育的妇女）其相关性分别为1 . 24和1 . 29 。
