data utilized in this study were 6800 records of lambs’ life longevity, and survival rate from 263 sires and 1839 dams collected from 1989 through 2009, from the lori-bakhtiari flock at shooli station in shahrekord. the data were analyzed, using linear and hazard ratio models along with weibul function. these models included such non genetic factors as year and month of birth, sex of lamb, type...

despite reduction in infant mortality rate, neonatal mortality rate particularly during the first 24 hours of life is still high in developing countries. a cross-sectional study was performed to determine neonatal mortality prevalence during the first 24 hours of life (f24nm) and its probable risk factors. data collection were performed by a structured form containing maternal and neonatal char...

OBJECTIVE To determine if paternal age elevates the risk of low birthweight (< 2500g, LBW), preterm birth (< 37 weeks gestation), and multiple gestation among mothers whose age does not predict an elevated risk. DESIGN/METHODS Population data on birth outcome, maternal age and paternal age was obtained from Alberta Health and Wellness for all births 1990-1996. RESULTS Among women aged 25 to...

Background We sought to determine the association between factors that affected clinical pregnancy and live birth rates in patients who underwent in vitro fertilization (IVF) and received intracytoplasmic sperm injection (ICSI) and/or laser assisted hatching (LAH), or neither. MaterialsAndMethods In this retrospective cohort study, the records of women who underwent IVF with or without ICSI and...

OBJECTIVES This report presents 2011 data on U.S. births according to a wide variety of characteristics. Data are presented for maternal characteristics, including age, live-birth order, race and Hispanic origin, marital status, attendant at birth, method of delivery, and infant characteristics (e.g., period of gestation, birthweight, and plurality). Birth and fertility rates are presented by a...

OBJECTIVES Summer time is a challenging period in obstetric care as many health care workers are on holiday. We aimed to explore the Scandinavian birth patterns and the Norwegian kindergarten reform's possible influence on time of delivery in Norway. METHODS A retrospective analysis using data (2000-12) from the medical birth registries of Denmark, Norway and Sweden was carried out. Annual da...

A study was made of seasonality in twin birth rate in Denmark between 1977 and 1984. We studied all twin births (N = 45,550) in all deliveries (N = 3,679,932) during that period. Statistical analysis using a simple harmonic sinusoidal model provided no evidence for seasonality. However, sequential polynomial analysis disclosed a significant fit to a fifth order polynomial curve with peaks in tw...

The proportion of women aged 40-44 undergoing IVF treatment covered by Maccabi Health Services increased between 2011 and 2014. Although age-specific birth rates did not substantially change over this time period, the demographic change was accompanied by an overall decrease in live births after IVF treatment. The relative contribution of changing population demographics vs. current age-related...