Maternal data: parity, living offspring's, and smoking days during pregnancy.
During the 17-22 week telephone interview women reported their race and ethnicity, marital status, education, parity (live plus still births), general health status, and of any bedrest during pregnancy.
In this study, important risk factors associated with unintended pregnancies were: parity, living arrangements with partner, marriage by ordinance and awareness of traditional, non-pharmacological contraceptive methods.
In the first model, sow parity, live births per litter, stillbirths per litter, sex, age at weaning, and the weight at weaning were used as the independent variables to determine an association with 9-wk BW.
Risk factors included were age at menarche and menopause, family history of breast cancer, parity, living children, age at first conception, exposure to hormonal therapy as oral contraceptive pills (OCP) in premenopausal women or hormone replacement therapy (HRT) in postmenopausal women, and benign or low risk breast lesions.
The sample for analysis included 74,671 first-parity live births were gestational age 37-44 weeks. 37-44 weeks
For lower parities, living with both parents of either the husband or the wife did not affect the time until next birth, although living with the husband's parents had a small delaying effect on the birth of the fourth child.
Parity includes live births only.
High parity (⩾3 live births) was associated with an increased risk of ER−PR− cancer (odds ratio (OR)=1.59, 95% CI 1.15 2.18, vs nulliparity).
