We investigated potential advantages in birth timing for mountain lion (Puma concolor) cubs. We examined cub body mass, survival, and age of natal dispersal in relation to specific timing of birth. We also investigated the role of maternal age relative to timing of births. We captured mountain lion cubs while in the natal den to determine birth date, which allowed for precise estimates of the p...

BACKGROUND Use of maternal health services is an effective means for reducing the risk of maternal morbidity and mortality, especially in places where the general health status of women is poor. This study was guided by the following objectives: 1) To determine the relationship between timing of first antenatal care (ANC) visit and type of delivery assistance 2) To establish the determinants of...

The timing of mental illness onset in relationship to birth of children was explored as a possible indicator of the extent to which mothers experienced difficulties in parenting and functioning. Analyses employed data from a longitudinal study of urban-based, primarily minority mothers with mental illness (N = 379) who had parenting responsibility for their minor children. We found that women w...

This study analyzes the trends in timing of entry into first marriage among Taiwanese. Applying the life table method, the variations in marriage timing associated with educational attainment and ethnic background are also examined across birth cohorts. The data used in this study come from the Taiwan Social Change Survey project. A comparison between birth cohorts shows that early and universa...

Since the description by Smellie in 1764, in a French midwifery text, that first suggested an obstetric origin for upper limb birth palsy, great strides have been made in both diagnosis and early and late treatment. This report presents an overview of selected aspects of this complex and extensive subject. Early treatment options are reviewed in the context of the present controversies regardin...

Using the Spanish Household Survey Data, we explore the determinants of the timing of the first child in Spain. Our aim is to determine the impact of income, wages and labour market situation in the decision of entry to motherhood. We estimate a discrete-time duration model, controlling for sample selection bias and unobserved heterogeneity. Our results show that employed women delay their firs...

The release of Enovid in 1960, the first birth control pill, afforded U. S. women unprecedented freedom to plan childbearing and their careers. This paper uses plausibly exogenous variation in state consent laws to evaluate the causal impact of the pill on the timing of first births and extent and intensity of women’s labor-force participation. The results suggest that legal access to the pill ...

Preterm birth is a major global health issue, and its causes and underlying mechanism remain obscure. We recently established a mouse model of spontaneous preterm birth. In this model, endometrial cellular senescence early in pregnancy via mTORC1-p21 signaling is a major contributor of preterm birth and fetal death, and these adverse phenotypes are restored by the inhibition of mTORC1 or p21. T...

Time distributions between selected events for women in Japan are examined, including birth, encounter with eventual husband, marriage, and first pregnancy. The author considers attitude toward marriage and its impact on timing of events. A model is developed to project marriage age and age at first pregnancy. Data are from the 1987 National Fertility Survey. (SUMMARY IN ENG)