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At least 109 records · Page 6Linked to original sources
PubMed1989

Birth-interval dynamics in rural Bangladesh and maternal weight.

This article reports on the results of a study conducted in rural Bangladesh on the influence of maternal weight on the components of birth intervals, including gestation and intrauterine mortality, the duration of postpartum amenorrhea, and the duration of waiting time to conception (the menstrual interval). When biological factors (including maternal age, parity, and supplementation practices) and behavioral variables, including religion, education, and occupation, were controlled, maternal weight was found to be related to the risk of intrauterine mortality and to the probability of resuming menses in the postpartum period. The implications of these findings for policies and programs in developing countries are discussed.

Amenorrhea↗
PubMed1976

Parity patterns of birth interval distribution.

A simplified model is presented for the measurement of inter-live birth interval distributions. Comparative analyses of "effective fecundability," the mean length and variation of postpartum infecundity, and the parity progression ratio based on this measurement model are presented using data from U.S. marriage cohorts and from an Indian sample. Parity differentials in these reproduction parameters are investigated, and the ramifications for fertility estimate and projection discussed.

Female↗
PubMed2005

Between-birth intervals in newly married Bulgarian families.

UNLABELLED: An essential component of the family planning of a newly married couple is determining not only the number of children but also the spacing of births. AIM: To study the preferences of newly married couples of Bulgarian ancestry from Plovdiv for between-birth intervals and factors that have effect on them. METHODS: The present transversal study was designed to investigate family planning in young families of Bulgarian origin from the town of Plovdiv at the time of submission of documents for state registration of marriage. The primary sociological information was gathered by a direct individual inquiry of 384 families. The data were compared with data from a similar study performed in 1995. RESULTS: Only one third of the women are willing to have a child immediately after marriage. Men prefer this to happen 1.61 +/- 0.07 year after the marriage while women favour longer protogenetic interval--1.84 +/- 0.06. The opinion of the spouses inquired about the age of women at last birth shows that there is statistically significant increase in this variable from 34.89 +/- 0.29 years in 1995 to 36.33 +/- 0.32 years in 2000. No statistically significant difference was found between the protogenetic intervals of 2000 and 1995. CONCLUSIONS: The increased age at marriage, the postponement of childbirth and increase in the anticipated age of last birth supports the thesis that the Bulgarian family type has undergone changes towards the family type characteristic for the countries in Western Europe.

Adolescent↗
PubMed1987

[Some aspects of the first and second birth interval].

"This article presents an analysis of the influence of demographic, socio-cultural and socioeconomic variables on the birth spacing pattern of women [in the Netherlands] with the aid of data from the Netherlands Fertility Survey 1982 and the follow-up study in 1985 (NFS'82/'85). Only the first and second intervals of women married for the first time and born between 1945-1964 are taken into account." The results indicate that 18 percent of the variance in the length of the first birth interval is due to such factors, suggesting that the influence of personal factors on fertility behavior is substantial. However, such variables account for only 8 percent of variance in the length of second birth intervals. (SUMMARY IN ENG)

Birth Intervals↗
PubMed2006

Vitamin A and beta-carotene supply of women with gemini or short birth intervals: a pilot study.

BACKGROUND: An adequate supply of vitamin A during pregnancy and breastfeeding plays an important role for development of foetus and neonate, especially in lung development and function. AIM OF THE STUDY: Aim of this pilot study was to analyze vitamin A and beta-carotene status and to investigate the contribution of nutrition to the vitamin A and beta-carotene supply in mother-infant pairs of gemini or births within short birth intervals. METHODS: Twenty-nine volunteers aged between 21 and 36 years were evaluated for 48 h after delivery. During this time frame a food frequency protocol considering 3 months retrospective was obtained from all participants. In order to establish overall supply retinol and beta-carotene levels were determined in maternal plasma, cord blood and colostrum via HPLC analysis. RESULTS: Regardless of the high to moderate socio-economic background, 27.6% of participants showed plasma retinol levels below 1.4 micromol/l which can be taken as borderline deficiency. In addition, 46.4% showed retinol intake <66% of RDA and 50.0% did not consume liver at all although liver contributes as a main source for preformed retinol. Despite high total carotenoid intake of 6.9 +/- 3.6 mg/d, 20.7% of mothers showed plasma levels <0.5 micromol/l beta-carotene. Retinol and beta-carotene levels were highly significantly correlated between maternal plasma versus cord blood and colostrum. In addition, significantly lower levels were found in cord blood (31.2 +/- 13.0% (retinol), 4.1 +/- 1.4% (beta-carotene) compared with maternal plasma. CONCLUSIONS: Despite the fact that vitamin A and beta-carotene rich food is generally available, risk groups for low vitamin A supply exist in the western world.

Adult↗
PubMed1979

Gestation and inter-birth intervals in the owl monkey (Aotus trivirgatus griseimembra).

A single, timed mating indicated a gestation period of 133 days for Aotus trivirgatus griseimembra. This figure is confirmed by approximate correspondence with minimum inter-birth intervals, results from radioimmunoassay of urinary oestrogens during pregnancy, and general agreement with a logarithmic plot of gestation period against body weight for simian primates. Birth data indicate that owl monkey females in present colonies in captivity breed throughout the year and will, on average, produce 3 infants every 2 years. There is no evidence of a characteristic post-partum oestrus.

Animals↗
PubMed1975

Open and closed birth intervals for once-married spouse-present white women.

Using the 1970 1/1,000 Public Use Sample of the U.S. population, the relationships of the closed and open birth intervals with parity and mother's age, with parity and marital duration, and with children ever born/marital duration and mother's age are analyzed. These findings both replicate and expand on Srinivasan's earlier research on the open interval. The open interval is more sensitive as an index of marital fertility when marital duration and parity are controlled than when mother's age and parity are controlled.

Adolescent↗