Pregnancy spacing and maternal morbidity in Matlab, Bangladesh.

OBJECTIVE: The study examines the relationship between pregnancy spacing and seven measures of maternal morbidity in Matlab, Bangladesh. METHOD: The study analyzes maternal morbidity data on 11,122 women who visited a health center during their third trimester of pregnancy between 1996 and 2002. Adjusted odds ratios were obtained through logistic regression analysis to assess the effects of pregnancy intervals of differing lengths while holding constant other influences (six variables) on maternal morbidity. RESULTS: After controlling these variables, pre-eclampsia and high blood pressure are significantly more likely for women with preceding inter-pregnancy intervals of less than 6 months or 75 months or more compared to those with intervals of 27-50 months. Premature rupture of membranes is significantly more likely following inter-pregnancy intervals of 6-14 months, and edema is significantly more likely following inter-pregnancy intervals over 50 months. CONCLUSION: Short and long inter-pregnancy intervals are associated with increased incidence of some maternal morbidities.

Pregnancy spacing and maternal morbidity in Matlab, Bangladesh.

OBJECTIVE: The study examines the relationship between pregnancy spacing and seven measures of maternal morbidity in Matlab, Bangladesh. METHOD: The study analyzes maternal morbidity data on 11,122 women who visited a health center during their third trimester of pregnancy between 1996 and 2002. Adjusted odds ratios were obtained through logistic regression analysis to assess the effects of pregnancy intervals of differing lengths while holding constant other influences (six variables) on maternal morbidity. RESULTS: After controlling these variables, pre-eclampsia and high blood pressure are significantly more likely for women with preceding inter-pregnancy intervals of less than 6 months or 75 months or more compared to those with intervals of 27-50 months. Premature rupture of membranes is significantly more likely following inter-pregnancy intervals of 6-14 months, and edema is significantly more likely following inter-pregnancy intervals over 50 months. CONCLUSION: Short and long inter-pregnancy intervals are associated with increased incidence of some maternal morbidities.

Gender preference and birth spacing in Matlab, Bangladesh.

Gender preference, particularly son preference, is believed to sustain high fertility in many Asian countries, but previous research shows unclear effects. We examine and compare gender-preference effects on fertility in two otherwise comparable populations in Bangladesh that differ markedly in their access to and use of contraception. We expect, and find, stronger effects of gender preference in the population that has more access to contraception and higher levels of contraceptive use. Thus gender preference may emerge as a significant barrier to further national family planning efforts in Bangladesh. We find that if a woman has at least one daughter, the risk of a subsequent birth is related negatively to the number of sons. Women with no daughters also experience a higher risk of having a subsequent birth; this finding suggests that there is also some preference for daughters. Son preference is strong in both the early and later stages of family formation, but women also want to have at least one daughter after having several sons.

Why are teenagers in the United States less likely to breast-feed than older women?

Teenage mothers are much less likely than older mothers to breastfeed their infants. The lower breastfeeding rate among teenagers aged 16-19, compared with women aged 20-29, is due almost entirely to the fact that teenage mothers tend to have characteristics associated with a lower likelihood of breastfeeding among all women, such as lower educational level, lower income, and being unmarried. Even so, nearly 40% of the difference between teenage mothers aged 15 or less and mothers aged 20-29 remains unexplained by these factors and may be due to developmental aspects of adolescence, such as greater egocentricity and greater concern about body image.

Correlates of short interbirth intervals in Peninsular Malaysia: their pathways of influence through breastfeeding and contraceptive use.

Recent research has shown that children born before and after short birth intervals run a considerably greater risk of dying in infancy or childhood than do others. This report investigates which women have short interbirth intervals, under what circumstances, and for what reasons. The analysis uses data from the Malaysian Family Life Survey to examine influences on the two main behaviors--breastfeeding and contraceptive use--that affect birth interval length, and assesses the the impact of these same variables on the probability of having a birth interval of less than 15 months. The analysis shows that many of the independent variables affect breastfeeding and contraceptive use in opposite directions, with no significant net effect on the likelihood of a short interval. For example, a woman's education is negatively related to the probability that she breastfeeds, positively related to the probability that she uses contraceptives, and has no significant effect on the likelihood that the interpregnancy interval is less than 15 months. Having a family planning clinic nearby is associated with less breastfeeding, offsetting whatever positive effects family planning clinics have on contraceptive use in terms of the percentage of birth intervals that are so short as to be detrimental to infant and child health. Hence, factors that increase contraceptive use do not necessarily reduce the incidence of short interbirth intervals, because they are also associated with reduced breastfeeding. We simulate the proportion of intervals that would be short for alternative combinations of breastfeeding and contraceptive use in the population and show that over the period covered by the data (1961-75), breastfeeding had a considerably greater effect on preventing short interbirth intervals than did contraceptive use.

Do women's breastfeeding experiences with their first-borns affect whether they breastfeed their subsequent children?

Data on women with at least two children are used to examine how the breastfeeding experience with the first child affects whether subsequent children are breastfed. Our results indicate that women most often repeat with later children the feeding decision they made with their first child. That is, those who breastfed their first child are very likely to breastfeed a later child and those who did not breastfeed their firstborn are unlikely to breastfeed a later-born. Among those who did not breastfeed their first child, education beyond high school increases the likelihood that they will switch to breastfeeding with a later-born. Those who breastfed their first child are less likely to breastfeed a later-born if the first breastfeeding experience was of short duration or was perceived to be unsuccessful or unsatisfactory or if the woman had not gone beyond high school or received anesthesia at the later birth. Hence, educational differences are greater at higher parities than at first parity.

The influence of isolation and aminooxyacetic acid (AOAA) on GABA in muricidal rats.

The influence of isolation was studied on the development of muricidal behavior and on brain GABA. GABA was significantly lower in several parts of the limbic system of brain taken from muricidal rats, when compared to their non-muricidal counterparts. Isolation potentiated the development of muricidal behavior and lowered GABA levels. Administration of aminooxyacetic acid (AOAA) resulted in a preferential elevation of GABA in the olfactory lobes. Muricidal behavior was inhibited during the AOAA-induced increase in GABA.