Characteristics and determinants of postpartum ovarian function in women in the United States.
Am J Obstet Gynecol
; 169(1): 55-60, 1993 Jul.
Article
in En
| MEDLINE
| ID: mdl-8333476
ABSTRACT
PIP: Between 1983 and 1987 in Baltimore, Maryland, researchers followed 60 breast-feeding mothers (55% single and 82% black) and 22 non breast feeding mothers (3% single and 93% white) for 72 weeks to better understand resumption of postpartum ovarian activity and the impact breast feeding has on resumption of ovarian activity. Laboratory personnel conducted daily urinary assays to detect ovulation and to evaluate the luteal phase. Ovulatory first vaginal bleeding episodes increased with the time (45% in the first 12 weeks to 100% after 49 weeks). 69% of breast-feeding mothers experienced an ovulatory first bleeding episode, but 47% of these cycles had reduced excretion of pregnanediol during the luteal phase, indicating a reduced likelihood of conception before first bleedings. The women's descriptions of perceived characteristics of their bleeding episodes were linked to ovulatory or anovulatory status. Specifically, women who reported regular or heavy bleeding were more likely to have had a preceding ovulation than those who reported spotting or light bleeding (84% vs. 35%; odds ration = 9.8; p .001). Resumption of ovulation was delayed in breast-feeding mothers. All non breast-feeding mothers menstruated within the first 12 weeks postpartum compared with just 20% of breast- feeding mothers. First ovulation occurred on average 45 days after delivery among non breast-feeding mothers and 189 days among breast- feeding mothers. The multivariate analysis revealed that breast-feeding episode contributed greatly and independently to the delay in ovulation (relative risk = .66 and .91, respectively; p .001). The protected effected of breast feeding remained even when mothers supplemented with bottle feeds 92% pregnancy rate over 6 months for both exclusive and partial breast feeders). These results indicated that breast feeding of increased frequency and suckling duration provides considerable protection from pregnancy, even when mothers use supplements.
Key words
Americas; Behavior; Biology; Blacks--women; Bottle Feeding; Breast Feeding; Case Control Studies; Cultural Background; Currently Married--women; Demographic Analysis; Demographic Factors; Developed Countries; Ethnic Groups; Family And Household; Family Characteristics; Family Relationships; Health; Infant Nutrition; Lactation; Life Table Method; Marital Status; Maryland; Maternal Physiology; Mothers; North America; Northern America; Nuptiality; Nutrition; Ovulation--determinants; Parents; Perception; Physiology; Population; Population Characteristics; Population Dynamics; Postpartum Amenorrhea; Postpartum Women; Prospective Studies; Psychological Factors; Puerperium; Reproduction; Research Methodology; Research Report; Studies; Time Factors; United States; Unmarried Mothers--women; Whites--women
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ovary
/
Lactation
/
Postpartum Period
Type of study:
Etiology_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Adult
/
Female
/
Humans
Country/Region as subject:
America do norte
Language:
En
Journal:
Am J Obstet Gynecol
Year:
1993
Type:
Article